The complete question is as follows: How many moles of a gas at 100 c does it take to fill a 1.00 l flask to a pressure of 152kPa
Answer: There are 0.0489 moles of a gas at [tex]100^{o}C[/tex] is required to fill a 1.00 l flask to a pressure of 152kPa.
Explanation:
Given: Volume = 1.00 L,
Pressure = 152 kPa (1 kPa = 1000 Pa) = 152000 Pa
Convert Pa into atm as follows.
[tex]1 Pa = 9.86 \times 10^{-6} atm\\152000 Pa = 152000 \times \frac{9.86 \times 10^{-6}atm}{1 Pa}\\= 1.5 atm[/tex]
Temperature = [tex]100^{o}C = (100 + 273) K = 373 K[/tex]
Using the ideal gas formula as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.5 atm \times 1.0 L = n \times 0.0821 L atm/mol K \times 373 K\\n = \frac{1.5 atm \times 1.0 L}{0.0821 L atm/mol K \times 373 K}\\n = 0.0489 mol[/tex]
Thus, we can conclude that there are 0.0489 moles of a gas at [tex]100^{o}C[/tex] is required to fill a 1.00 l flask to a pressure of 152kPa.
Benzene (C6H6) burns in air to produce carbon dioxide and liquid water. How much heat is released per mole of benzene combusted? The standard enthalpy of formation of benzene is 49.04 kJ/mol
Benzene (C6H6) burns in air to produce carbon dioxide and liquid water.The heat released in KJ per gram of the compound reacted with oxygen is -41.83 KJ.
What is heat ?
Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred.
The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.
Reaction as follows;
2C6H6 + 15O2 → 12CO2 + 6H2O
2x49.04 2x10 12x-393.5 6x-285.8
= [ 12(-393.5 )+6(-285.8) ] - [ 2(49.04)+(2x10) ]
= - 6936.8 - 98
= - 6534.8 KJ/mole
Per gram of benzene
= ( -6534.8 KJ / 2 mole of C6H6) (1 mole of C6H6 / 78.108g )
= -41.83 KJ / mole
Thus, The heat released in KJ per gram of the compound reacted with oxygen is -41.83 KJ.
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What do these two changes have in common?
a slice of banana turning brown
acid rain weathering a marble statue
Select all that apply.
Both are only physical changes
Both are only chemical changes
Both are caused by heating
Both are caused by cooling
Answer:
both are only physical changes
Answer:both are only chemical
Explanation:
why the bond between hydrogen and oxygen in a water molecule is more polar than the bond between hydrogen and nitrogen in an ammonia molecule.
Since oxygen has a higher electronegative charge than hydrogen, the two bonds that are created will be polar covalent, which means that oxygen.
which has a higher electronegative charge, will have a partial negative charge, and hydrogen, which has a partial positive charge. Each water molecule has a small hydrogen charge that attracts neighboring oxygen atoms and negatively charged areas of other molecules. While holding water together and giving it intriguing features, the hydrogen bond between the hydrogen of one water molecule and the oxygen of another... For water, this is how it functions. Due to the molecule's bent structure, water (H 2 O) is polar. Most of the negative charge from the oxygen is indicated by the shape.
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Give an example of direct and indirect evidence geologists use to study the interior of the Earth
Geologists use rock samples including sedimentary rocks as direct evidence and seismic waves as indirect evidence.
What are sedimentary rocks?They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.
The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.
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You just created the equality 1 fluid oz = 29. 7 mL. Use this equality to determine how many ounces of water will be measured using the measuring cup introduced before Part A when making the cake.
Express your answer numerically in ounces to two significant figures
2 ounces of water will be measured using the measuring cup introducing before part A when making the cake.
Both units (that is, ml and ounces) are equal, meaning they measure the same quantity and can be converted to each other.
Given that:
1fluid oz = 29.7ml
Part A measurements are not shown. Therefore, we will explain using hypothetical values.
Let the amount of water measured with the measuring cup in part A be 10 ml.
The equivalent number of ounces (x) is calculated as follows:
1 fluid oz = 29.7ml
x = 10ml
By using equality
x * 29.7ml = 1 fluid oz * 10ml
By canceling common units
x * 29.7 = 10 fluid oz
Divide both sides by 29.7.
x = 0.3367 fluid oz
Approximate to the nearest half.
x = 0.5 fluid oz
This means that the equivalent amount of water is 0.5 ounces.
What if the measurement is 55mL.
We apply the same steps here also:
x fluid oz = 55ml
x *29.7 = 1 fluid oz * 55 ml
Divide both sides by 29.7
x = 2 fluid oz
This means that the equivalent amount of water is 2 ounces.
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1
2
3
6
8
g
10
Which two pieces of fossil evidence support the idea of continental drift?
bacteria and petrified wood
O Glossopteris and bacteria
O Lystrosaurus and Glossopteris
O petrified wood and Tyrannosaurus
Lystrosaurus and Glossopteris are two pieces of fossil evidence support the idea of continental drift.
One of the geologist's first theories about how continents moved over time was continental drift. The science of plate tectonics has been largely supplanted the hypothesis of the continental drift. Alfred Wegener has been most closely associated with the continental drift idea. Wegener released a paper in the early twentieth century describing his notion that continental landmasses were "drifting" across the Earth, occasionally ploughing through seas and into one other. He developed the term "continental drift" to describe this process.
Wegener found similarities in the coasts of eastern South America as western Africa and hypothesised that those countries had originally been part of a supercontinent called Pangaea, which had separated and travelled many kilometres away over geologic time. He also mentioned nearly comparable fossil creatures and rock layers that happened on vastly different continents. Colbert discovered Lystrosaurus fossils in the Transantarctic Mountains of Antarctica. Such fossils belonged to something like a species previously discovered in Africa, proving that the world's two most distant continents were formerly linked.
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Answer: C. Lystrosaurus and Glossopteris
Explanation:
Select the correct answer. what is the name of a system that converts thermal energy into a form of useful mechanical or electrical energy?
a. incubator
b. heat engine
c. centrifuge
d. vacuum column
e. spectrophotometer
Heat engine is a system that converts thermal energy into a form of useful mechanical or electrical energy.
In thermodynamics, the heat engine is a system which is able to convert the heat or thermal energy into mechanical or electrical energy which can be used in order to perform mechanical work. This is achieved by bringing the a particular working substance to a lower state temperature from a higher state temperature.
There are a different types of heat engines in which the Carnot engine possesses the maximum efficiency. Some examples of heat engines are firearms, thermal power station etc.
Hence, the correct option is b. heat engine.
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How many moles are in 50 grams?
3.125 moles of oxygen are present in 50 g.
A mole is the volume of a substance that contains 6.022 X 1023 of the substance's particles, atoms, ions, molecules, etc. A mole is a unit for counting molecules, ions, or atoms. Divide the given mass of an element by its molar mass to find the number of moles in that quantity.
The atomic weight of an element, or its relative atomic mass, on the periodic table, expressed in g/mol, is its molecular mass.
The molar mass of oxygen is 16 g/mol, and there are 3.125 moles in a given amount of mass and molar mass.
Consequently, 3.125 moles of oxygen are present in 50 g.
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Name the following alkyne. Be sure to use hyphens (-) not endashes (-).
2,2-Dimethylbut-1-yne .The alkyne name is formed using the IUPAC nomenclature system.
First, the length of the longest continuous carbon chain (containing the triple bond) must be identified. In this case, it is a four-carbon chain (but-).
Second, the location of the triple bond must be determined. In this case, it is located on the first carbon atom so the prefix 1- is used.
Third, the substituents must be listed in alphabetical order. In this case, there are two methyl groups (2,2-dimethyl).
The final name is 2,2-Dimethylbut-1-yne.
2,2-Dimethylbut-1-yne .The alkyne name is formed using the IUPAC nomenclature system.
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What is the molarity of 122.5 g of AlCl3 in 1.0 L of solution? (MM = 133 g/mol)
Molarity of 122.5 grams of AlCl₃ in 1 Liter solution is 0.921 M.
What is molarity?Molarity is defined as no. of moles of solute present in per liter of solution and it is represented as:
M = n/V
First we have to calculate the moles of AlCl₃ and it can be calculated as:
n = W/M, where
W = given mass of = 122.5g
M = molar mass of = 133g/mole
n = 122.5 / 133 = 0.921 moles
Now molarity in 1 liters can be calculated as:
M = 0.921/1 = 0.921M
Hence, molarity of AlCl₃ is 0.921M.
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What is the concentration of nitrogen gas (N2), in parts per million, in a solution that contains 0.008 grams of nitrogen gas dissolved in 1,000 grams of water?
Answer: The concentration of nitrogen gas in parts per million is 7.99 ppm.
Explanation:
Solute is defined as the component of the solution present in a smaller proportion while the solvent is defined as the component of the solution present in a larger proportion.
Concentration in ppm (parts per million) represents the amount of solute in milligrams present per kilograms of solution.
[tex]\text{Concentration in ppm}=\frac{\text{Mass of solute (in mg)}}{\text{Mass of solution (in kg)}}[/tex]
OR
[tex]\text{Concentration in ppm}=\frac{\text{Mass of solute (in grams)}}{\text{Mass of solution (in grams)}}\times 10^6[/tex] ......(1)
Given values:
Mass of solute (nitrogen gas) = 0.008 g
Mass of solvent (water) = 1000 g
Mass of solution = [0.008 + 1000] g = 1000.008 g
Plugging values in equation 1:
[tex]\text{Concentration in ppm of nitrogen gas}=\frac{0.008g}{1000.008g}\times 10^6\\\\\text{Concentration in ppm of nitrogen gas}=7.99 ppm[/tex]
Hence, the concentration of nitrogen gas in parts per million is 7.99 ppm.
in a paper chromatogram why is substance impure
Answer:
Chromatography is used to see if substance is pure or to identify the subtances in a mixture. Components of a mixture are identified by the relative distance travelled compare to the distance travelled by the solventExplanation:
I hope it helpsin this lab, you perform the above reaction starting with 20.0 L of propane at STP. what volume of h2o will be produced
1 mole of any gas occupies 22.4 L volume. The molecular weight of water is 18 grams. Thus 18 gram of Water will also occupy 22.4 L.We know that at STP one mole of any gas occupies 22.4litres . It means that one mole of hydrogen also occupies 22.4litres of volume at STP. So 10moles of hydrogen gas will occupy =22.4×10=224litres of volume at STP.
Please help I will give brainliest!
Answer:
b, H2O(s) r H2O(g)
Explanation:
entropy is heat, so increase in heat would mean water gets evaporated or melted, or both in this case. so the only choice above that showed increase in heat is from solid(ice) to gas(water vaper) due to increase in heat in the reaction.
It takes 75.0mL of a 2.50M HCl solution to neutralize 55.0mL of a base unknown concentration. Calculate the concentration of a unknown basic solution.
If it takes 75.0mL of a 2.50M HCl solution to neutralize 55.0mL of a base unknown concentration, the concentration of a unknown basic solution is 1.83M.
How to calculate molarity?Molarity in chemistry is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of two solutions in a neutralization reaction can be calculated as follows:
CaVa = CbVb
Where;
Ca = molarity of acidCb = molarity of baseVa = volume of acidVb = volume of baseAccording to this question, 75.0mL of a 2.50M HCl solution is required to neutralize 55.0mL of a base unknown concentration. The concentration of the solution can be calculated as follows:
2.5/75 = Cb/55
0.0333333333 × 55 = Cb
Cb = 1.83M
Therefore, 1.83M is the molarity of the unknown basic solution.
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What should we do to reduce the risk when working with concentrated acids and bases? a) Never work with it b) Work with large volumes c) Neutralize it d) Dilute them
To reduce the risk when working with concentrated acids and bases, it is important to never work with them directly, work with large volumes, neutralize them, and dilute them.
a) Never work with it - Concentrated acids and bases can be extremely dangerous and should never be handled directly.
b) Work with large volumes - In order to reduce the risk, it is important to always work with large volumes of the acid or base so that the concentration is lower.
c) Neutralize it - It is important to neutralize both acids and bases before disposing of them in order to reduce the risk of harm to people or the environment.
d) Dilute them - Diluting acids and bases by adding water can reduce their concentration, making them safer to work with.
To reduce the risk when working with concentrated acids and bases, it is important to never work with them directly, work with large volumes, neutralize them, and dilute them.
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a sample of lithium goes through a temperature change of +44.1°C while absorbing 713.5 joules of heat. the specific heat capacity of lithium is 3.58J/(g°C). What is the mass of this sample
Answer choices:
4.52 g
199 g
0.22 g
16.2 g
Answer:
Mass of lithium = 0.22 gram (Approx.)
Explanation:
Given:
Change in temperature Δt = 44.1 °c
Absorbing heat Q = 713.5 joules
Specific heat capacity of lithium c = 3.58 J/(g°C)
Find:
Mass of lithium
Computation:
We know that;
Q = mcΔt
m = cΔt / Q
Mass of lithium = (3.58)(44.1) / (713.5)
Mass of lithium = (157.878) / (713.5)
Mass of lithium = 0.2212
Mass of lithium = 0.22 gram (Approx.)
what is the working principle og fractional distillation?
Answer:
The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with a lower boiling point starts to boil first and convert into vapors. Let consider a liquid-liquid mixture of A and B where A is more volatile than B this mixture can be separated by the following process:
Explanation
What are the composite units of each type of solid? What types of forces hold each type of solid together? Match the items in the left column to the appropriate blanks in the sentences on the right. Reset Help nonbonding Molecular solids are those solids whose composite units are together by the following kinds of intermolecular forces: Molecular solids are held bonding coulombic forces and hydrogen lonic solids are those solids whose composite units are Ionic solids are held together Individual atoms by dispersion forces network covalent dispersion forces, dipole- dipole forces Atomic solids are those solids whose composite units are Atomic solids can themselves bo divided into three following categories, where each is held together by a different kind of force. The first category, which includes only the noble gases in their solid form and is held together by relatively weak atomic solids. The second category, which is held together by bonds and includes such examples as copper or silver, is atomic solids. The last category, which is hold together by and includes such examples as diamond, graphito, and silicon dioxide, is atomic solids ions metallic molecules covalent bonds lon-dipole forces
Solids known as molecular solids are made up of molecules. Intermolecular forces such as hydrogen bonds, dipole-dipole forces, and dispersion forces hold together molecular solids. Solids with ions as their constituent parts are known as ionic solids. Ion-dipole forces keep ionic solids together.
Atomic solids are those whose constituent atoms make up their entire structure. Atomic solids can be broken down into the three categories below, each of which is held together by a distinct set of forces. Dispersion forces atomic solids is the first category, which only consists of noble gases in their solid states and is held together by coulombic forces that are comparatively weak. Metallic atomic solids fall under the second category, which is held together by nonbonding bonds and contains substances like copper and silver as examples. Network covalent atomic solids are the final group of materials that are held together by covalent bonds and include materials like silicon dioxide, graphite, and diamond.
What five intermolecular forces exist?Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least have LDF.
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I need some help please
Answer:
13=C
14=D
Explanation:
I cant explane the right formula but my answer is correct
Calculate the moles in 8334 grams of krypton, show work
A balloon originally has 0.100 moles of helium and has a volume of 0.500 L. If 0.670 grams of He are added to the balloon, what will the new volume be, in L
Helium: The new volume of the balloon is 0.6182 L.
Colorless, odourless , tasteless, inert, non-toxic helium is a monatomic gas. It is the lightest element in the periodic table and the second most abundant element in the universe.
The new volume of the balloon can be calculated using the ideal gas law, which states that PV = nRT, where P is the n represents the number cubic moles of gas, V represents the volume, R is the real gases constant, and the temperature is T.
First, we need to calculate the number of moles of helium in the balloon after the additional 0.670 grams have been added:
n = 0.670 g He/4.003 g/mol = 0.167 mol
The total number of moles in the balloon is now 0.267 mol. We can use the ideal gas law to calculate the new volume:
V = (0.267 mol)(0.0821 L·atm/K·mol)(273 K)/1 atm = 0.6182 L
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Someone help please!
Answer:
Explanation:
NaNO3
Just do a double displacement reaction, this is what you get (plus water)
The reaction shifts to the left, and the concentrations of SO2(g) and O2(g) increase.
Simply put, the system will seek to stay at equilibrium by shifting to compensate for change.
Complicatedly put, consider the fact that K (the equilibrium constant) is the concentration of products raised to their coefficients over the concentration of the reactants raised to their coefficients. If we write an expression for K, we get this:
[tex]K=\frac{[SO_3]^2}{[SO_2]^2[O_2]}[/tex]
If we assume that, at equilibrium, all of the substances have a concentration of 1 molar, we get that
[tex]K=\frac{[1]^2}{[1]^2[1]}=1[/tex]
If we increase SO3, K will increase. This means the system has now been removed from equilibrium. For example, if you add another mole of SO3, you get
[tex]Q=\frac{[2]^2}{[1]^2[1]}=4[/tex]
(Q is just K, but not at equilibrium.)
Since the system wants to stay at equilibrium, it will work to restore equilibrium. The only way to do this is to increase the value of the reactants (the bottom numbers), meaning the reaction will shift to the left. Worded differently, when Q>K, the reaction will shift left.
A 1. 0108 g sample of an unknown nonelectrolyte is dissolved in 10. 0090 g of benzophenone and produces a solution that freezes at 35. 8 C. If the pure benzophenone melted at 48. 1 C, what is the molecular weight of the unknown compound?
The molecular weight of the unknown compound is 80.864g.
Give a definition of freezing point depression.Only the solute's concentration affects freezing point depression; the solute's mass or chemical composition have no bearing. When it's cold outside, salt is often used to prevent ice from forming on roads by lowering the freezing point of water.
Depression in freezing point is Kb x m
T(f) - T = Kb x m
48.1 - 35.8 = 9.8 x m
m = 1.255
m = moles of solute x 1000/mass of solvent
moles of solute x 1000 / 10.0090 = 1.255
moles of solute = 0.0125
moles = mass / molar mass
1.0108 / molar mass = 0.0125
molar mass = 1.0108 / 0.0125
molar mass = 80.864
so the molecular weight is 80.864g.
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What is the Answer of the picture
Answer: d
Explanation: I got it right
Please help I’ll give brainliest.
Answer:
i think its the first one
Explanation:
i could be wrong
1.
Which of the following best explains the
relationship between molecules and atoms?
A
Atoms are molecules that have a charge.
B
Atoms have smaller parts, called
molecules.
С
Molecules are made up of two or more
atoms.
D
Molecules are atoms that have no mass.
Calculate the concentration of the rubidium hydroxide solution in g dm³. (relative atomic mass: Rb = 85; relative formula mass: RbOH = 102)
Answer:
assalam o aalaikum
Explanation:
o
90
180
270
360 x
-1
Given that 0 find the value of a and the value of b.
(2 marks)
.
. Which one is formed by the combination of many tissues?
Answer:
organs is the right answer
Explanation:
An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system.
Hope that helps you bud..!
Take care..
Buhbye!
PLEASE HELP! 50 PTS! WILL GIVE BRAINIEST!!!
Answer:
Explanation:
C ADBBECDEAAnswer:
1 - C
2 - A
3 - D
4 - B
5 - B
6 - E
7 - C
8 - D
9 - E
10 - A
Explanation: