Equilibrium Expressions and Constants in Chemical Reactions Assignment

Assignment Task

1. Write the equilibrium law expression for each of the following

• Carbon dioxide gas reacts with solid carbon to produce carbon monoxide
• Sodium carbonate, Na2(CO3)(aq), reacts with calcium hydroxide, Ca(OH)2(aq), to produce sodium hydroxide, NaOH(aq), and calcium carbonate, Ca(CO3)(s).

2. What is the value of the equilibrium constant at 200°C for the decomposition of phosphorus pentachloride gas to phosphorus trichloride gas and chlorine gas? At equilibrium, [PCl3(g)] = [Cl2(g)] = 014 mol/L and [PCl5(g)] = 4.3 x 10 ^-4 mol/L. 

3. The reaction below has an equilibrium constant, K, is 16.0 at SATP. Determine the equilibrium concentrations if both reactants have an initial concentration of 0.750M. 

CO(g) + H2O(g) ⇄ CO2(g) + H2(g)

4. The reaction H2(g) + F2(g) ⇄ 2 HF(g) has an equilibrium constant of 1.63 x 10 ^-3 . Calculate the equilibrium concentration of fluorine gas if 0.50 mol of hydrogen gas and 0.60 mol of fluorine gas are initially placed in a 1.0 L container.

5. There are 2.5 mol of carbonyl chloride gas, COC l 2(g), initially introduced into a 10.00 L container and the following reaction is allowed to reach equilibrium:

CO(g) + C l 2(g) ⇄ COC l 2(g)

6. Find the equilibrium concentrations of carbon monoxide gas and chlorine gas if the equilibrium constant, K, is 8.2 x 10-2 at 626°C.

7. Liquid dinitrogen tetroxide, N2O4(l), was used as a fuel in the Apollo missions to the moon. In a closed container the gaseous form, N2O4(g) decomposed to nitrogen dioxide, NO2(g).

• Write the balanced chemical equation for this 
• The equilibrium constant, K, for this reaction is 0.87 at 55 ^° A vessel filled with N2O4(g) at this temperature is analysed twice during the course of the reaction and found to contain the following concentrations shown below. For each trial, determine whether the system is at equilibrium, and if not, predict the direction in which the reaction will proceed to achieve equilibrium.
  • Trial 1: [N2O4(g)] = 5.30 mol/L; [NO2(g)] = 2.15 mol/L
  •  Trial 2: [N2O4(g)] = 0.80 mol/L; [NO2(g)] = 1.55 mol/L

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