The number of moles of oxygen required to generate 28 moles of water from the reaction is 14 moles
Balanced equation2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 moles of water were obtained from 1 mole of oxygen
How to determine the mole of oxygen neededFrom the balanced equation above,
2 moles of water were obtained from 1 mole of oxygen
Therefore,
28 moles of water will be obtained from = 28 / 2 = 14 moles of oxygen
Thus, 14 moles of oxygen are needed for the reaction
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The effective temperature of a star is related to its..
solar system.
luminosity.
absolute magnitude.
color.
Answer:
color
Explanation:
The effective temperature is directly related to the color of the star: the higher the temperature, the bluer the light emitted by the star.
Calculate the volume (in cm3) that 4. 00 cm3 of gas at 30 oC will occupy at 130oC when the pressure is kept constant
The volume of the gas is 5.32 cm³.
To calculate the volume of the gas, we use Charles' law.
Charles' lawCharles' law states that at constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. This can be expressed mathematically as
Formula:
V/T = V'/T'............. Equation 1Where:
V = Initial volume of the gasV' = Final volume of the gasT = Initial temperature of the gasT' = Final temperature of the gas.Make V' the subject of the equation.
V' = VT'/T......... Equation 2From the question,
Given:
V = 4 cm³T = 30 °C = 303 KT' = 130 °C = 403 KSubstitute these values into equation 2
V' = (4×403)/303V' = 5.32 cm³Hence, the volume of the gas is 5.32 cm³.
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Predict the effect of each of the following on the indicated equilibrium system in
terms of the direction of equilibrium shift (forward, reverse, or neither)
H2(g) + Cl2(g) <--> 2HCl(g) + 194 kJ
a) addition of Cl2
b) removal of HCI
c) increased pressure
d) decreased temperature
e) removal of H2
f) decreased pressure
g) addition of a catalyst
h) increased temperature
i) decreased system volume
D
The effects of each of the following on the equilibrium system in the question are as follows :
A) Addition of Cl₂ ; equilibrium shifts to reverse
B) Removal of HCl ; equilibrium shifts to the reverse
C) Increased pressure ; neither
D) Decresed temperture ; neither
E) Removal of H₂ ; Forward
F) Decreased pressure : neither
G) Addition of catalyst : Forward
H) Increased temperature : Forward
I) Decresed system volume : Neither
Effects on equilibrium systemThe change in volume and pressure in an equilbrium system with equal number of gaseous molecules of reactants and products will not have an effect on the direction of shift of the equilibrium system. But the change in temperature, increase or decrease of reactants and products will have an effect on the direction of the equilibrium shift of the system.
Hence we can conclude that the effects of the following on the equilibrium system is as listed above.
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How much heat is required, in calories, to raise the temperature of 57. 8 g of silver from 17. 0degrees C to 43. 5 degrees C, if the specific heat of silver= 0. 057 cal/g degrees C
Which is an example of an automatic decision that doesn’t require a lot of thinking?
A. To do homework or not
B. What to buy as a gift for someone
C. What to read
D. Whom to invite to your house to play
Answer
to do homework or not
Explanation:
you can figure it out in one second
Answer:
To do homework or not
Explanation: You should always do homework or else you get in big trouble
Why do some scientists have difficulty communicating about their research to nonscientists?
Answer:
Non-scientists aren't exposed to the information that scientists have in their field of study. Scientists also have their research based on facts, while non-scientists can be biased on their beliefs and chose to ignore data and logic.
what is diffusion ,??
Diffusion is the net movement of anything generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential.
How many outer atoms and lone pairs are present in a molecule with a trigonal pyramidal shape?.
Answer:
3 outer atoms and 1 lone pair
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are produced when 27.5g of sodium are added to water?
Answer:
.598 moles of H2
Explanation:
Find the balanced equation of the reaction
2Na + 2 H2 0 ====> 2 Na OH + H2
27.5 gm of Na is 27.5/ 22.989 =1.196 moles
from the equation, each mole of Na produces 1/2 mole of H2
1.196 moles * 1/2 = .598 moles of H2
The reaction given by
2Na+2H_2O—»2NaOH+H_2Moles of sodium:-
Given mass/Molar mass27.5/231.196molSo
2mol Na Produces 1 mol H_21 mol Na Produces 0.5mol H_21.196 mol Na Produces=0.5(1.196)=0.598mol H_2For a gaseous reaction, N2 + 3H2 gives 2NH3. If 20 ml of nitrogen completely reacts with hydrogen, then what is the volume of produced NH3?
N2(g) + 3H2(g) → 2NH3(g)
20ml of nitrogen
to find:the volume of produced NH3
solution:So, 1 volume of nitrogen gas reacts with 3 volumes of hydrogen gas to produce 2 volumes of ammonia gas.
For this gaseous reaction in which all the reactants and products are gases we could write a chemical equation:
1 volume N2(g) + 3 volumes H2(g) → 2 volumes NH3(g)
1 volume of N2 is 20 ml so 2 volume of NH3 will be 40 ml .
Then , 20 ml N2 will give 40 ml of NH3
= 40 ml
Help please!
An Arrhenius acid increases the concentration of hydrogen ions when dissolved in solution.
True
False
Answer:
The answer is true
Explanation:
An Arrhenius acid is a substance that increases the concentration of hydrogen ions in solution when it is dissolved in water.
Answer:
false
Explanation:
A sample of crushed rock is found to have 4. 81 x 10^21 atoms of gold, how many moles of gold are present in this sample?
A. 7. 99 x 10^-3 moles
B. 1. 57 x 10^-1 moles
C. 1. 25 x 10^3 moles
D. 2. 47 x 10^5 moles
Answer:
A
Explanation:
Recall that a mole of any substance contains 6.02 × 10²³ amounts of that substance.
In other words, a mole of gold atoms contains 6.02 × 10²³ gold atoms.
Hence, by dimensional analysis, we have that:
[tex]\displaystyle 4.81\times 10^{21} \text{ Au} \cdot \frac{1\text{ mol Au}}{6.02\times 10^{23} \text{ Au}} = 7.99\times 10^{-3} \text{ mol Au}[/tex]
Therefore, there is about 7.99 × 10⁻³ moles of gold present in the sample.
In conclusion, the answer is A.
What volume of a o.25m solution can be prepared with 28.5g of k2s molar mass 110.26
Answer: Can you repost the answer it will not let post my answer
Explanation: pleaee
What is a neutralization reaction?
Answer:
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions
Explanation:hope this helps<33
Changes in which measurement do not shift the equilibrium of a chemical system?
A.) temperature
B.) time
C.) pressure
D.) concentration
Explanation:
i think time. .........
Changes in time do not shift the equilibrium of a chemical reaction.
What is equilibrium?Chemical equilibrium is the state where no net change in the quantity of reactants as well as products occurs during a reversible chemical reaction. A reversible chemical reaction occurs when the products react with the original reactants as soon as they are generated.
What is chemical reaction?A chemical reaction occurs when one or more compounds, known as reactants, are changed into one or more distinct substances, known as products. Chemical elements or compounds are examples of substances. A chemical reaction organizes the constituent atoms of both the reactants to produce various products.
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HELP PLEASE
Earth seems to be the only planet in our solar system that can support life. Which of these is NOT a reason why life is found on Earth?
Question 3 options:
The presence of water on Earth.
It is the perfect distance from the Sun.
It only has slight surface elevation differences
Answer:
it only has slight surface elevation differences
Explanation:
What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.
The substance oxidized causes the other substance to be reduced and is called the:.
Answer:
Reducingagent
Explanation:
Hope this helps you :)
Pls mark brainliest :P
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Tori
What is the name and formula for the most common natural ore for copper?.
Answer:
Clalcopyrite is the most important and major source of copper material. It is widely spread copper-iron sulfide minerals with chemical formula (CuFeS^2)
The most common natural ore of copper is chalcopyrite with the chemical formula CuFeS₂.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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Pregnant women are often cautioned against cleaning cat litter boxes. This is because Toxoplasma, an intestinal parasite of cats, can be transmitted from infected feces to the expectant mother and ultimately to the fetus. For these reasons, Toxoplasma is considered
a noninfectious disease.
a communicable disease.
an addictive disease.
a nosocomial disease.
a zoonotic disease.
a necrotizing disease.
Answer: a communicable disease
Explanation: key word was transmitted and it was transmitted from a INFECTED living thing and then transmitted to another living thing
Suppose two gasses in a container have a total pressure of 1.20 atm. What is the pressure of gas B if the partial pressure of gas A is 0.68 atm
Answer:
The partial pressure of gas B is 0.52atm
Explanation:
Pt = Pa + Pb
Pb = Pt - Pa
Pb = 1.20 atm - 0.68 atm
Pb = 0.52 atm
Can a pressure change shift the equilibrium position in every reversible reaction? Explain
No, a pressure cannot change shift the equilibrium position in every reversible reaction.
How the pressure affect the reversible reaction ?If the pressure increases, the position of equilibrium shift in the direction with the small amount of molecules. This decreases the effect of the change. When the reaction will shift towards the products that means the reaction favor forward.
Factors that affect equilibrium position in reversible reaction.PressureCatalystTemperatureConcentrationFrom the above conclusion we can say that a pressure cannot change the shift of equilibrium position in every reversible reaction.
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Outline the laboratory procedure for preparing a specific volume of a dilute solution from a concentrated stock solution
The various steps of how to prepare a specific volume of a dilute solution from a concentrated stock solution is described below.
Preparation of a dilute solution from stock solutionA stock solution is the solution that contains the standard concentration of a chemical compound.
A diluted solution is the solution shoes concentration has been decrease through addition of a solvent like water.
To prepare a dilute solution from a stock solution the following is done:
the needed volume of the stock solution is calculated,the volume is added to a volumetric flask,water is then added into the volumetric flask till it reaches the calibration line.Learn more about stock solutions here:
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What is the molarity of a methanol solution produced when 0.2 L of a 3 M solution was diluted to 0.8 L?
A-0.2M
B- 0.4M
C-0.75M
D-0.8M
The molarity of the methanol solution produced at the given number of moles and volume is 0.75 M.
Molarity of the methanolThe molarity of the methanol is determined from the ratio of the number of moles of the methanol to the volume of the methanol.
The molarity of the methanol is calculated as follows;
Molarity = moles/volume
moles = 0.2 L x 3 M = 0.6 mole
Molarity = 0.6 mol/0.8 L
Molarity = 0.75 M
Thus, the molarity of the methanol solution produced at the given number of moles and volume is 0.75 M.
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what is 2CO in a chemical formula
Answer:
Co2
Explanation:
The coefficient 2 is multiplied on the invisible 1 (Co1) so it becomes CO2
Or
2co represents 2 molecule of carbon monoxide
Each element in the periodic table can be represented by a chemical symbol. Match each element to its chemical symbol.
Na
N
H
Cl
Hg
Mercury
arrowBoth
Sodium
arrowBoth
Nitrogen
arrowBoth
Chlorine
arrowBoth
Hydrogen
arrowBoth
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct pair of Element and it's symbol ~
Mercury - HgSodium - Na Nitrogen - NChlorine - ClHydrogen - HFor a typical human height of 2 meter what is the horizon distance on earth (r=6378) (b mars R=3,340
For a typical human height of 2m, horizon distance on earth and mars is 5km & 3.7km respectively.
How do we calculate the distance?Horizontal distance will be calculated as:
D = √h² + 2hr, where
h = height of the human = 2m
r = radius
First we calculate distance on earth where radius of earth is 6378km or 6378000mD = √(2)² + 2(2)6378000
D = 2√6378001 = 5051m = 5km
Now we calculate distance on mars where radius of mars is 3340km or 3340000mD = √(2)² + 2(2)3340000
D = 2√3340001 = 3674m = 3.7km
Hence required horizon distance on earth and mars is 5km & 3.7km respectively.
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Why was October 12,1999 a historic day ?
The United Nations Population Fund designates today in history as the approximate day on which the world population reached six billion.
:)
Hello people ~
What are the most key factors of solid-state reactions?
a) Size of the particles
b) Mechanical properties of solids
c) Thermodynamic and kinetic factors
d) Environmental factors
Answer:
A and C
Explanation:
Size of the particles
It's denoted to surface area which is key factor of solid state reaction,higher the size late the reaction occursThermodyanmic and kinetic factors
the reaction depends upon temprature and rest factors like light , humidity etc
Answer:
Option AOption CExplanation:
What are Solid State Reactions ?
The reactions that are performed in the absence of solvents either by melting/grinding the materials together at the beginning of the reaction or by adding heat to the reaction are known as solid-state reactions Solid-state reactions are preferred because they reduce the generation of chemical wastes and costFactors
They depend on thermodynamic and kinetic factors, as mentioned before, heat is addedSize of the particles is also important because the rate of the reaction depends on the sizeNatural factors such as pressure, temperature, presence of sunlight, etc.What was the initial reactant concentration for the reaction described in part a?.
Answer:
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line, y = mx + b. Part A The reactant concentration in a zero-order reaction was 0.100 M after 100 s and 1.50x10-2 M after 360 s. What is the rate constant for this reaction? Order 0 1 | 2 Integrated Rate Law Graph [A] =- kt +[A]o [A] vs. t In[A] = -kt + In[A]o In[A] vs. t = kt + Á A vs. t Slope -k -k k Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash. ► View Available Hint(s) koth = 3.27x10-4 M S Submi Previous Answers Correct Important: If you use this answer in later parts, use the full unrounded value in your calculations.
Explanation:
1. As you increase the temperature of a gas in a sealed, rigid con-
tainer, what happens to the density of the gas? Would the results
be the same if you did the same experiment in a container with
a movable piston at a constant external pressure? Explain.
Answer:
If one increases the temperature of a gas in a sealed, rigid container, the density of gas will not change.
The key to this answer lays in the ideal gas equation:
pV = nRT
Thus, one can write: n = (m)/(M)where m is the mass of the gas and M is the molar mass of a gas.
pV = (m)/(M) RT
Hence, if one decides to divide the entire equation with volume, V, one may write:
p = (m)/(VM) RT
ρ = (m)/(V), where ρ is density
p = (ρ)/(M) RT
If one increases the temperature, in order to keep balance, the pressure will be increased, also. Container is rigid, so that means the volume is constant.
However, this will not affect the density because there is no difference in volume (V = const.) or the amount of gas (n = const).
If one had a container with a piston, yet, constant pressure, the change of the temperature will impact the density.
Explanation: