Question

What is the numerical value of Kc

for the following reaction if the equilibrium mixture contains 0.34 M
CO2
, 0.031 M
H2
, 0.25 M
CO
, and 0.30 M
H2O
?

CO2(g)+H2(g)⇌CO(g)+H2O(g)

Answer 1

The general expression for the equilibrium constant
`\( K_c \)` for the reaction of:

• 
  `\[ \text{CO}_2(g) + \text{H}_2(g) \rightleftharpoons \text{CO(g)} + \text{H}_2\text{O(g)} \]`

Given formula:

• 
  `\[ K_c = \frac{[\text{CO}][\text{H}_2\text{O}]}{[\text{CO}_2][\text{H}_2]} \]`

Solution

We have to substitute the given concentrations into the given formula

• 
  `\[ K_c = ((0.25)(0.30))/((0.34)(0.031)) \]`

• 
  `\[ K_c = (0.075)/(0.01054) \]`

• 
  `\[ K_c \approx 7.11 \]`

Answer

The answer is 7.11