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WorksheetsKc and Equilibrium
Total questions: 12
Worksheet time: 1hrs 16mins
2 NO(g) + O2(g) ⇌ 2 NO2(g)
Hydrogen can be produced by this reaction.
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
In an experiment 4.20 mol of carbon monoxide were mixed with 2.00 mol of steam. When the reaction reached equilibrium, 1.60 mol of hydrogen had been formed.
What is the value of the equilibrium constant, Kc, for this reaction?
0.30
0.41
1.54
2.46
When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is established.
NH3(g) ⇌ 0.5N2(g) + 1.5H2(g)
What is the total number of moles of gas present in this equilibrium mixture?
1.5
2.0
2.5
3.0
A and B react together in this reversible reaction.
A + 3B ⇌ C + 2D
A mixture of 10 mol of A and 10 mol of B were left to reach equilibrium. The equilibrium mixture contained 4 mol of B.
What is the total amount, in moles, of substances in the equilibrium mixture?
14
16
18
20
Hydrogen is produced by the reaction of methane with steam. The reaction mixture reaches a state of dynamic equilibrium.
CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g) ∆H = +206 kJ mol−1
Which of the following shows how the equilibrium yield of hydrogen and the value of the equilibrium constant are affected by the changes shown?
Change: Increase pressure
Effect on equilibrium yield of H2(g): decrease
Effect on value of Kc: decrease
Change: Add a catalyst
Effect on equilibrium yield of H2(g): increase
Effect on value of Kc: no effect
Change: Increase temperature
Effect on equilibrium yield of H2(g): increase
Effect on value of Kc: increase
Change: Remove CO(g) as formed
Effect on equilibrium yield of H2(g): increase
Effect on value of Kc: increase
Use the information about the following solutions to answer the question below.
Solution F: This is a mixture of 1 mol of propanoic acid, 1 mol of methanol and 2 mol of water.
Solution G: This was originally the same mixture as solution F but it has been left to reach equilibrium.
Solution G was found to contain 0.5 mol of propanoic acid. Which one of the following is the value of the equilibrium constant (Kc) for the following equilibrium?
propanoic acid + methanol ⇌ methyl propanoate + water
0.2
1
5
10
Ethanoic acid reacts with ethanol in a reversible reaction represented by the equation below.
In an experiment 3.0 mol of ethanoic acid were mixed with 1.0 mol of ethanol and when the reaction had reached equilibrium 0.9 mol of water had been formed.
CH3COOH(l) + C2H5OH(l) ⇌ CH3COOC2H5(l) + H2O(l)
The equilibrium constant for the reaction under these conditions is
0.20
0.23
3.9
4.3
Ethanoic acid reacts with ethanol in a reversible reaction represented by the equation below.
In an experiment 3.0 mol of ethanoic acid were mixed with 1.0 mol of ethanol and when the reaction had reached equilibrium 0.9 mol of water had been formed.
CH3COOH(l) + C2H5OH(l) ⇌ CH3COOC2H5(l) + H2O(l)
The percentage of ethanoic acid converted into the ester CH3COOC2H5 in this reaction is
22.5%
30%
43%
90%
The data below refer to the industrial production of nitric acid from ammonia.
Possible units for the equilibrium constant, Kc, for reaction 2 are
mol−2 m6
mol−1 dm3
no units
mol dm−3
The equilibrium constant, Kc, for a reaction which leads to ozone (O3) formation is shown in the image
More ozone is formed as the temperature rises. Which one of the following is true at equilibrium?
When ozone molecules collide with nitrogen they may form nitrogen monoxide.
The enthalpy change for the reaction has a negative sign.
Less ozone is formed at high pressure.
At a fixed temperature, the magnitude of Kc increases as the concentration of NO decreases.
