the particular gas effusion was 21.0. and the methane effusion rate is 47.0 The molar mass of the unknown gas is approximately 28.6 g/mol
The process through which a gas manages to escape through with a small hole or highly permeable barrier is known as effusion. A gas's rate of effusion is inversely proportional to its molar mass squared. The following equation describes this relationship: rate1 / rate2 = (sqrt(molar mass2) / sqrt(molar mass1)). where rate1 and rate2 are the rates of effusion of the two gases and molar mass1 and molar mass2 are the molar masses of the two gases.Given the rate of effusion of the unknown gas is 21.0 mL/min, and the rate of effusion of pure methane (CH4) is 47.0 mL/min, we can use the above equation to find the molar mass of the unknown gas:
(21.0 mL/min) / (47.0 mL/min) = sqrt(molar mass unknown) / sqrt(16.04 g/mol)
Squaring both sides of the equation, we get:
(21.0 mL/min)^2 / (47.0 mL/min)^2 = (molar mass unknown) / (16.04 g/mol)
Solving for molar mass unknown we get:
molar mass unknown = (16.04 g/mol) * (21.0 mL/min)^2 / (47.0 mL/min)^2
The molar mass of the unknown gas is approximately 28.6 g/mol
Please note that the above calculation is based on the assumption that the temperature and pressure are the same for both gases and that the gases are ideal
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An increase in the temperature of a liquid decreases the rate of
evaporation, true or false?
Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
Use the data table to answer the question that follows.
Production Possibilities for One Year
Cheese
(millions of tons)
United States
Italy
Tomatoes
(millions of tons)
2
1
EEEEE
Which statement is supported by the data table?
O The United States should produce neither cheese nor tomatoes but rather import them.
The United States should produce all its own cheese and tomatoes for consumption.
The United States should specialize in tomatoes and trade them for cheese from Italy.
O The United States should specialize in cheese and trade it for tomatoes from Italy.
On this scenario, the US may consume more than its PPC by specializing in cheese and swapping it for Italian tomatoes.
What makes this possible?Italy’s cheese output is lower than that of the United States.Italy cannot consume cheese other than PPC unless these products are supplied by another nation. Through an exchange deal with Italy, the United States can enjoy tomatoes in addition to PPC. Because cheese production in the United States is substantially higher than in Italy, we may assume that the United States can offer this commodity to other nations without jeopardizing its consumption. However, tomato output in the United States is the same as in Italy, but because the United States is a larger country than Italy, tomato consumption in the country may be affected.
As a result, if tomatoes are obtained from another nation, tomato consumption in the United States may surpass the PPC of tomatoes. This may be accomplished through barter, with the United States supplying cheese to Italy and Italy supplying tomatoes to the United States.
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Why did the scientists only add earthworms to half of the pipes?
...
An annelid can regenerate to some extent after being split in half, and in some species, you may even get two worms. However, the common earthworm only regenerates from the tail end; Every time, the head end dies.
Can worms withstand being divided in half?The Washington Post reports that many earthworms can lose several segments from their head end and grow back, and that almost all worms can regrow their tails if they are amputated. However, for some worms, the likelihood of fully regenerating decreases with the number of segments removed.
What substance does the earthworm secrete to stabilize the tunnel walls?Coelomic fluid, which is secreted by many earthworms, makes it easier for them to move through the soil. This fluid forms a cement-like substance that lines the burrows of some burrowing species to prevent the walls from falling down.
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A beaker was filled with a mixture of 40 liters of water and a liquid chemical in the ratio of 3 : 5, respectively. If 2 percent of the initial quantity of water and 5 percent of the initial quantity of liquid chemical evaporated each day during a 10-day period, what percent of the original amount of mixture evaporated during this period
30% of the original amount of mixture evaporated during the 10-day period.
In order to determine the percentage of the original amount of mixture that evaporated during the 10-day period, we need to first determine how much water and how much liquid chemical were present in the beaker initially.
Given that the ratio of water to liquid chemical is 3:5, we can assume that the total number of parts is 8 (3+5).
So, the original amount of water is 3 parts / 8 parts = 0.375
And the original amount of liquid chemical is 5 parts / 8 parts = 0.625
We can then use this information to determine how much of each substance evaporated each day:
2% of 40 L of water = 0.02 x 40 L = 0.8 L
5% of 40 L of liquid chemical = 0.05 x 40 L = 2 L
We can then add up the total amount of each substance that evaporated over the 10 days to find the total amount that evaporated from the beaker:
0.8 L of water evaporated/day x 10 days = 8 L
2 L of liquid chemical evaporated/day x 10 days = 20 L
Finally, we can add up the total amount of each substance that evaporated and divide by the total amount of the original mixture to find the percentage of the original amount that evaporated:
(8 L + 20 L) / (40 L + 40 L) = 0.3 or 30%
So 30% of the original amount of mixture evaporated during the 10-day period.
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When using a TSO-C129 or TSO-C196 GPS for navigation and instrument approaches, any required alternate airport must have
TSO-C129 and TSO-C196 refer to non-WAAS GPS systems. TSO-C146 refers to WAAS-enabled GPS systems. If non-WAAS GPS is used for navigation and instrument approaches, all required alternate airports must have non-GPS approved operational instrument approach procedures.
TSO-C129 - Airborne Auxiliary Navigation Sensor for Global Positioning System equipment with airborne extensions. TSO-C196 – Auxiliary airborne navigation sensor for GPS units with airborne augmentation.
TSO certification means minimum performance standards for certain materials, parts and equipment used in commercial aircraft. Authorization to manufacture materials, parts, or equipment in accordance with TSO standards is referred to as TSO authorization.
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The molar mass of bismuth (\ce{Bi}BiB, i) is \pu{208. 98 g/mol}208. 98 g/mol208, point, 98, space, g, slash, m, o, l. Calculate the mass in grams of a sample of \ce{Bi}BiB, i containing \pu{7. 35x10^23}7. 35×10 23 7, point, 35, times, 10, start superscript, 23, end superscript atoms
The mass in grams of a sample of Bi with 7.35 1023 atoms should be 255 grams.
What does molar mass in chemistry refer to?A substance's mass is measured in grams per mole, or molar mass. The molar mass of a substance can be determined, as demonstrated in this video, by adding the molar masses of the substance's constituent atoms. The substance's molar mass can then be used to determine the number of moles in the substance and converted to mass.
The molar mass of Bi is 208.98 g/mol.
1 mole Bi = 208.98 g/mol = 6.023×10²³ no of atoms
So, the mass in grams should be
mass = ( 208.98 g/mol ×7.35 × 10²³) ÷ (6.023×10²³)
mass = 255 grams.
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Rutherford used his gold foil experiment as evidence for a new atomic model. He suggested that the atom contained a small
positively charged nulceus surrounded by a large void filled with only a few electrons orbiting the nucleus.
What other experiment or evidence assisted in the creation of this model?
A)
Electrons in orbit would be captured by a nucleus.
B)
The precise location of an electron is impossible to acertain.
o
The plum pudding model of the atom agreed with the nuclear model
D)
Thomson discovered the atom contained negatively charged electrons.
Nature of Science
SC6N22) New Evidence
ID:7495
Answer:
The plum pudding model of the atom agreed with the nuclear model
Explanation:
Answer:
D) Thomson discovered the atom contained negatively charged electrons.
Explanation:
Without previous discoveries such as the electron, Rutherford would not have generated his nuclear model. So, Thomson had to discover the atom contained negatively charged electrons first.
Hope this helps :)
A student increases the temperature of 300 cm balloon from 30 cm to 60 cm what will the new volume be of the balloon be(remeber to be careful with the units. )
After solving the equation: The new volume of the balloon will be 600 cm3.
What is volume?Volume is a measure of the three-dimensional space occupied by a substance or object. In chemistry, volume is most commonly measured in liters (L). It is used to measure the amount of a substance that is present. For instance, when performing a reaction, the volume of the reactants is measured to determine the molar amounts of the reactants.
This is because the volume of a balloon is directly proportional to its temperature. So when a balloon is heated, the volume increases. In this case, the balloon's temperature was increased by 30 cm, so the volume was increased by 300 cm3 (30 cm x 10 cm3, since the volume of a balloon is proportional to its temperature to the power of 3). Thus, the new volume is 600 cm3 (300 cm3 + 300 cm3).
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How many atoms are in a 4.67 g sample of silicon?
Answer:
3.62
Explanation:
What are the types of elements answer?
The three types of elements are metals, non-metals as well as metalloids, there are placed in a periodic table.
In a periodic table, metals are placed in s-block and d-block. While non-metals as well as metalloids are placed in p-block. Metals are generally lustrous, malleable as well ductile in nature and are usually hard in nature while non-metals lack these properties. Metalloids are the elements whose chemical as well as physical properties lies between both metals and non-metals. Examples of metals are sodium and potassium. Examples of non-metals are carbon and phosphorus while examples of metalloids are silicon and germanium.
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What does 14 mean in c14?
14 mean in C14 is C14 has atomic mass of 14.
The radioactive carbon isotope with the longest half-life, carbon-14, whose decay enables precise dating of archaeological artifacts. Six protons and eight neutrons make up the carbon-14 nucleus, giving it an atomic mass of 14. Additionally, the isotope is employed as a tracer to monitor specific carbon atoms as they undergo chemical or biological changes.
The 14 in C14 represents the number of neutrons and protons in the nucleus of that atom or we can called it atomic mass. Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14,
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Consider the following reaction: CS2(g) + 4H2(g) CH4(g) + 2H2S(g). The equilibrium constant K is about 0.31 at 900.°C. What is Kp at this temperature? A) 2.9 103 B) 3.2 10–3 C) 3.3 10–5 D) 3.0 101 E) 1.1 10–3
The Kp of the reaction as it has been shown is 2.9 × 10^3 Option A
What is the Kp?We know that the equilibrium constant is the constant that has to do with the ease with which the reactants that are in the system can be converted into the products. In this case we have been given the reaction equation as it has been shown in the question.
Let us all now bear in mind that the reaction ghat we have here is a gas phase reaction and since the reaction is a gas phase reaction the equilibrium constanta that has been given as K can also be written in terms of the partial pressures of the gasses that are present in the system and this ius the bed rock of the answer that we woulod give above. The Kp can now be written as a scientific notation as shown above.
Then;
kp = Kc/(RT)^∆n
Kp = equilibrium constant using pressure
Kc = equilibrium constant using concentration
R = gas constant
T = temperature
n= difference in number of moles
Kp = 0.31/(0.082 × 1173)^-2
Kp = 2.9 × 10^3
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You have a 400-mL container containing 55. 0% He and 45. 0% Ar by ma at 25°C and 1. 5 atm total preure. You heat the container to 100°C Calculate the ratio of PHe : PAr
The ratio of the container with PHe: PAr will be given as= 12.2/1
All pressures present in a reference system are added together to get the total pressure, or ptot. Bernoulli (see Fluid mechanics) defined this pressure as the sum of the static pressure (p), dynamic pressure (pdyn), and geodetic component (g, z) that exist in a fluid along a stream line in a frictionless flow.The pascal (Pa), often known as kilograms per square meter per second (kg/m1s2), is the SI unit for pressure. Prior to 1971, pressure in SI was only expressed in terms of newtons per square meter; this nomenclature for the unit was added at that time. While a fluid is stationary or when you are moving with it, you have static pressure. You would feel an equal amount of air pressure from all sidesTo know more about pressure here
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The ratio of PHe: PAr will be given as= 12.2/1
All pressures present in a reference system are added together to get the total pressure, or ptot. Bernoulli (see Fluid mechanics) defined this pressure as the sum of the static pressure (p), geodetic component (g, z) and dynamic pressure (pdyn), that exist in a fluid along with a stream line in a frictionless flow. The pascal (Pa), often known as kilograms per square meter per second (kg/m1s2), is the SI unit of pressure. Before 1971, pressure in SI was expressed in terms of newtons per square meter. You have static pressure, while a fluid is stationary or when you are moving with it. You would feel an equal amount of air pressure from all the sides.
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What are the two factors that affect the arrangement of particles in a substance?
The two factors that affect the arrangement of particles in a substance are kinetic energies and intermolecular forces.
In chemistry, all the substances are composed of tiny particles which are in constant motion.
The substance which is made up of atoms, ions or molecules, all the particles possess kinetic energy and keep moving in all direction. On the other hand, intermolecular forces are also present in a substance which keeps the particles together within their boundaries and doesn't let them go far away. In this way substances maintain their shape, arrangement and properties.
In sum, two factors play a crucial role in maintaining the properties of a substance: Kinetic energy and intermolecular forces.
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What is the nuclear symbol for an ion with a charge of +220 protons and 24 neutrons 
Answer:
Hey there! The nuclear symbol for an ion with a charge of +220 protons and 24 neutrons would be written as follows:
220+ 24
The symbol consists of two parts: the atomic number (220+) and the atomic mass (24). The atomic number is the number of protons in the nucleus of an atom, and it is represented by a superscript on the left side of the symbol. The atomic mass is the total number of protons and neutrons in the nucleus, and it is represented by a subscript on the right side of the symbol.
In this case, the atomic number of the ion is 220, which indicates that it has 220 protons in its nucleus. The atomic mass is 24, which indicates that it has a total of 220 protons + 24 neutrons = 244 particles in its nucleus.
________________________________________________________
How do we represent the properties of atoms and ions using nuclear symbols?Nuclear symbols are a way of writing down the important information about atoms and ions in a short and easy-to-read format. They usually consist of two parts: the atomic number and the atomic mass. The atomic number tells us how many protons an atom has in its nucleus, and the atomic mass tells us the total number of protons and neutrons. For example, the nuclear symbol for carbon is 6 12C, which tells us that carbon has 6 protons and 12 particles (6 protons + 6 neutrons) in its nucleus.
How do we determine the number of protons, neutrons, and electrons in an atom or ion?To determine the number of protons in an atom or ion, we can look at its atomic number, which is usually written as a superscript on the left side of the nuclear symbol. For example, if the nuclear symbol for an atom or ion is written as 6 12C, we can tell that it has 6 protons. To determine the number of neutrons, we can subtract the atomic number from the atomic mass. For example, if the atomic mass is 12 and the atomic number is 6, then the number of neutrons is 12 - 6 = 6. To determine the number of electrons, we can just look at the overall charge of the atom or ion. If it is neutral, then it will have the same number of protons and electrons. If it is positive or negative, then it will have more or fewer electrons than protons, respectively.
For the reaction H2(g) + Cl2(g) 2HCl(g), Kc = 1.22 1033 at a temperature of 301 K. What is Kp at this temperature? A) 1.22 1033 B) 3.01 1034 C) 4.93 1031 D) 7.43 1035 E) 2.00 1030
The reaction would have a Kp of 3.01 * 10^34. Option B
What is the Kp of the reaction?We know that the equilibrium constant of the reaction is the value that would be able to show us how much of the reactants that have been converted to products when the reaction has attained the point of equilibrium at a given temperature.
As such we would have that;
Kp= Kc (RT)^Δn
Kp = ?
Kc = 1.22 * 10^ 33
R = 0.082
T = 301 K
Then we have that;
Kp = 1.22 * 10^ 33(0.082 * 301)^ 1
Kp = 3.01 * 10^34
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5. Calculate the heat energy required, in joules, to melt 5.00 x 10² grams of ice at 0.0°C.
Here is the Conclusion 240. Heat energy affects a substance’s intermolecular forces as the substance changes between states.
How to get the State changes?Heat energy increases during the following state changes
Solid - (melting)
Liquid -gas (evaporation)
Solid- gas (sublimation)
Heat energy decreases during the following state changes
Gas- liquid (condensation)
Liquid → solid (freezing)
Gas –solid (deposition)
An intermolecular force (IMF) (or secondary force) is the force that mediates the interaction of molecules, including electromagnetic forces of attraction or repulsion that act between atoms and other types of nearby particles, such as atoms or ions.
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The heat energy required, in joules, to melt 5.00 x 10² grams of ice at 0.0°C. 2016.6 J.
How does heat energy become created?When the temperature rises, molecules and atoms move faster and collide, creating heat generated (also known as heat energy). Thermal energy is the heat that results from heated substance's temperatures.
Calculation :The following phrase may be used to determine the change in heat energy in a process like melting.
S = H * m / T
where:
S = entropy [kJ]
H = fusion heat = 3.36*10¹ [J/kg]
m = mass = 0.02 [kg]
T = temperature in kelvin = 273 [K]
S = 0.02 * 5.00 * 10² / (273 + 0)
S = 2016.6 J
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The complete question is -
Calculate the heat energy of 5.00 * 10² g of ice when it melts at 0.0°C. The heat of fusion of ice is 3.36 x 10'J/kg.
Identify the methods used to monitor a reaction as it occurs in the reaction flask. polarimeter O A spectrometer OB pressure measurement Ос. D. all of the above choices are correct
The methods used to monitor a reaction as it occurs in the reaction flask are d) all the above
A polarimeter is an analytical hardware component that measures the polarization of light and is used to analyze the optical activity of chemicals. Optical activity refers to the ability of a material to rotate polarized light and the extent to which such a phenomenon occurs.
A spectrometer is one of the scientific instrument/method used to separate and measure the spectral components of physical phenomena. A spectrometer is a broad term often used to describe an instrument that measures a continuous variable of a phenomenon whose spectral components are mixed in some way.
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Suppose you run this reaction in a solvent that dissolves elemental mercury and elemental oxygen. What is the equilibrium-constant expression in terms of molarities for the reaction, using (solv) to indicate solvation.
At 55 °C, the equilibrium constant for this reaction is 6.68. A pharmaceutical chemist prepares 15.0 L of an initial 0.275 M acetic acid and 3.85 M ethanol solution.
Create an equation that can be solved for x by plugging the equilibrium concentrations (expressed in terms of x) into the formula for the equilibrium constant. (d) The equation from subpart (c) is cubic (it bears the formula ax3 + bx2 + cx + d = 0). In general, it is impossible to solve cubic equations in closed form. Indicate the direction (toward product or toward reactants) in which the mixture must change if it is not at equilibrium. The concentrations of SO 2 Cl 2 and SO 2 are 0.108 M and 0.052 M, respectively, in a mixture of the three gases that has reached equilibrium.
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A gas has a pressure of 1.74 atm when the temperature is 237K. The gas is then
heated until the temperature measures 312K. What will be the new pressure? *
2.29 atm
1.32 atm
O 128662.56 atm
Answer:
[tex]\boxed {\boxed {\sf 1.99 \ atm}}[/tex]
Explanation:
We are finding the pressure with a change in temperature, so we should use Gay Lussac's Law. This states that the pressure is directly proportional to the temperature. The formula is:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
The original pressure is 1.74 atmospheres and a temperature of 273 Kelvins. When the gas is heated the new temperature is 312 Kelvins, but the new pressure is unknown. Substitute all the known values into the formula.
[tex]\frac {1.74 \ atm}{273 \ K}=\frac {P_2}{312 \ K}[/tex]
Since we are solving for the new pressure, we need to isolate the variable P₂. It is being divided by 312 Kelvin and the inverse of division is multiplication. Multiply both sides by 312 K.
[tex]312 \ K *\frac {1.74 \ atm}{273 \ K}=\frac {P_2}{312 \ K}* 312 \ K[/tex]
[tex]312 \ K *\frac {1.74 \ atm}{273 \ K}= P_2[/tex]
The units of Kelvin (K) will cancel.
[tex]312 \ *\frac {1.74 \ atm}{273 }= P_2[/tex]
[tex]1.98857143 \ atm= P_2[/tex]
The original measurements have 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place.
The 8 in the thousandth place tells us to round 8 in the hundredth place up to a 9.
[tex]1.99 \ atm \approx P_2[/tex]
The new pressure is approximately 1.99 atmospheres.
Draw the structure of the diene that reacts with one equivalent of HBr to form the following two compounds as the only bromoalkene products
Diene is a type of organic compound that contains two double bonds between two carbon atoms.
What are Atoms?
Atoms are the smallest particle of any element that still maintains the properties of that element. Atoms are made up of a nucleus surrounded by one or more electrons. The nucleus is composed of protons and neutrons, and the electrons orbit around the nucleus. Atoms of different elements have different numbers of protons, neutrons, and electrons, which is what gives them their unique properties.
Diene is a conjugated molecule, meaning that its double bonds alternate with single bonds. Diene molecules are used in a variety of chemical reactions, including the formation of polymers and the synthesis of pharmaceuticals.
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C3H8 + 3O2 → 3CO2 + 4H2
How many moles of oxygen are necessary to react completely with 7.2 moles of hydrogen?
(round to the tenth's place)
Taking into account the reaction stoichiometry, a amount of 5.4 moles of oxygen are necessary to react completely with 7.2 moles of hydrogen.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 3 O₂ → 3 CO₂ + 4 H₂
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 3 molesCO₂: 3 moles H₂: 4 molesMass of O₂ requiredThe following rule of three is used: If by reaction stoichiometry 4 moles of H₂ are produced by 3 moles of O₂, 7.2 moles of H₂ are produced by how many moles of O₂?
moles of O₂= (7.2 moles of H₂×3 moles of O₂)÷ 4 moles of H₂
moles of O₂= 5.4 moles
Finally, 5.4 moles of oxygen are required.
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Which of the following answer choices would BEST describe Marco Polo's reaction when he saw the Chinese using coal
The majority of Europeans at the time had never heard of coal, which Marco Polo described as "black stones...which burn like logs."
Initially, charcoal was utilized in the production process, which caused extensive deforestation in northern China. However, coal had fully replaced charcoal by the end of the 11th century.
They do indeed have an abundance of firewood. However, due to the massive population and the large number of bathhouses and baths that are continually being heated, it would be impossible to supply enough firewood, as everyone takes a bath at least three times each week, and in the winter, if they can, every day. Since every man of rank and means has a bathroom of his own at home, the abundance and low cost of these stones result in significant wood savings.
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Potassium(k)=1s22s22p63s23p64s
it’s asking for the electron configuration
The atomic number of Potassium(K) is 19
Knowing the number of electrons in the K atom is necessary before we can write the potassium(K) electron configuration.
There are 19 electrons. All 19 electrons will be positioned in orbitals surrounding the nucleus of the potassium(k) atom when the configuration is written.
there are some steps:
The initial two electrons in the configuration for potassium(k) will be in the 1s orbital.The following two electrons for potassium enter the 2s orbital since the 1s orbital can only accommodate two electrons. Then the 2p orbital receive the six electrons. The p orbital has room for up to six electrons. The first Six electrons will be positioned in 2p orbital, while the next two will be positioned in the 3s. As the 3s are currently full, we'll switch to the remaining six electrons to the 3p.Now we change the 4s orbital and add the final electron.To know more about Orbital, click here:
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Calculate the mass of metal oxide produced during the decomposition of 1280 g of 77.5% pure magnesium carbonate!
Decomposition of one mole of magnesium carbonate (84 g) produces one mole of magnesium oxide (40 g). Thus, 1280 g of magnesium carbonate will produce 609 g of MgO.
What is magnesium carbonate?Magnesium carbonate is an ionic compound formed by donation of two electrons from magnesium metal to the carbonate group.
The decomposition reaction of magnesium carbonate is written below:
[tex]\rm MgCO_{3} \rightarrow MgO + CO_{2}[/tex]
As per this reaction, one mole of magnesium carbonate produces one mole of MgO.
molar mass of MgCO₃ = 84 g/mol
molar mass of MgO = 40 g/mol
84 g of MgCO₃ gives 40 g of MgO. Then the mass of MgO produced by 1280 g of MgCO₃ is:
mass of MgO = (1280 × 40)/84 = 609 g.
Therefore, the mass of MgO produced is 609 g.
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According to the stoichiometry of the given chemical equation,2.66 moles of aluminium oxide are formed when 4 moles of oxygen reacts.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
As 3 moles of oxygen gives 2 moles of aluminium oxide, thus, 4 moles of oxygen will give 4×2/3=2.66 moles.
Thus, 2.66 moles of aluminium oxide are formed when 4 moles of oxygen reacts.
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What is the density of object A (give 2 sig figs)?
The mass of the object compared to its volume
How do you calculate an object’s density?The density of an item is defined as its mass divided by its volume. Density is commonly expressed in grams per cubic centimeter (g/cm3). Remember that grams are a unit of mass and cubic centimeters are a unit of volume (the same volume as 1 milliliter).
When multiplying or dividing, the result should have the same number of significant digits as the number in the computation that has the fewest. This is the volume measurement with only two sig figs in this case, hence the density should be given as 2.9 g/cm3. The density of an item is the ratio of its mass to its volume. Density is defined as density = mass/volume, or D = m/v.
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[H+] is _______.
17.8 ×10-9
5.62×10-9
1.78 ×10-6
56.2×10-9 [please hurry i only have 5 minutes
Answer:
[H+] is 5.62×10-9
Explanation:
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Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 7.41 mL of O2 had passed through the membrane, but only 3.47 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas
164 g is the molar mass of the gas that had passed through.
Effusion is defined as the pace at which a volume changes over time. We apply Graham's Law to determine the rate of gas diffusion. According to this law, the rate of a gas's effusion or diffusion is inversely related to the gas's molar mass squared.
[tex]\frac{Rate Gas 1}{Rate Gas 2}[/tex]=[tex]\frac{ \sqrt{MW gas 2} }{ \sqrt{MW gas 1} }[/tex]
Let gas 1 be Oxygen so Molar mass = 32 g / mol
Let x be gas 2. Molar mass = unknown
rate gas 1 = 7.41 ml/unit time
rate gas 2 = 3.47 ml / unit time
So, 7.41 / 3.47 = [tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
2.135 = s[tex]\frac{\sqrt{x} }{\sqrt{36} }[/tex]
[tex]\sqrt{x}[/tex] = 12.81
so, x = 164 = molar mass of unknown gas
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Nitric acid has the formula HNO3. If there are 3. 55x10^23 atoms of O in the sample, how many moles of nitric acid are there?
Nitric acid has the formula HNO₃. If there are 3. 55x10²³ atoms of O in the sample, the number of moles of nitric acid is 0.589moles.
Define mole.How many moles of a substance are present in a reaction is determined by comparing its mass to the mass of one mole. One mole, or Avogadro's number, is equal to the sample mass divided by the molar mass, or 6.023×10²³ moles. You can calculate the total number of atoms or molecules in a sample by dividing the number of moles by the Avogadro constant. The equation is: Number of Molecules=Atoms or Molecules /6.022×10²³.
1 mole oxygen atom contains 6.02×10²³ atoms
how many moles of oxygen contains 3.55x 10²³atoms
Moles of nitric acid = 3.55x 10²³atoms/6.02 ×10²³atoms
Moles of nitric acid = 0.589moles.
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