For the following reactions, determine the equilibrium constant equation. You
must show your workings within your submission.
1) CO2(g) + H2(g) CO(g) + H2O(g)
2) 2NO(g) + 2H2(g) N2(g) + 2H2O(g)
3) Cu(s) + 2Ag+(g) Cu2+(g) + 2Ag(s)
4) H2(g) + I2(g) 2HI(g)
1) Kc = [CO][H2O]/[CO2][H2]
2) Kc = [N2][H2O]^2/[NO]^2[H2]^2
3) Kc = [Cu2+][Ag]^2/[Cu][Ag+]^2
4) Kc = [HI]^2/[H2][I2]
To determine the equilibrium constant equation for each reaction, we need to write the balanced chemical equation first. Then, we can use the stoichiometric coefficients to construct the equilibrium constant expression.
1) CO2(g) + H2(g) ⇌ CO(g) + H2O(g)
The balanced equation shows a 1:1 stoichiometric ratio for both CO2 and H2. Therefore, the equilibrium constant expression for this reaction is:
K = [CO(g) * [H2O(g)] / [CO2(g)] * [H2(g)]
2) 2NO(g) + 2H2(g) ⇌ N2(g) + 2H2O(g)
Since the stoichiometric coefficients of NO and H2 are both 2, the equilibrium constant expression for this reaction is:
K = [N2(g)] * [H2O(g)]^2 / [NO(g)]^2 * [H2(g)]^2
3) Cu(s) + 2Ag+(g) ⇌ Cu2+(g) + 2Ag(s)
In this reaction, Cu and Ag both have stoichiometric coefficients of 1. Therefore, the equilibrium constant expression is:
K = [Cu2+(g)] * [Ag(s)]^2 / [Cu(s)] * [Ag+(g)]^2
4) H2(g) + I2(g) ⇌ 2HI(g)
The balanced equation indicates a stoichiometric ratio of 1:1 between H2 and I2. Hence, the equilibrium constant expression is:
K = [HI(g)]^2 / [H2(g)] * [I2(g)]
These are the equilibrium constant equations for the given reactions.