Answer
The equilibrium constant value for this reaction is equal to 0.548
Work Step by Step
1. Write the $K_{eq}$ expression:
$K_{eq} = \frac{[Products]}{[Reactants]} = [CO_2]$**
** Notice: We do not consider solids in the expression.
2. Use the given values to find the $K_{eq}$ value.
$K_{eq} = 0.548$