Chapter 18, Problem 47QP

Consider the decomposition of calcium carbonate:

${\text{CaCO}}_{\text{3}}(s)\rightleftarrows \text{ CaO(}s{\text{) + CO}}_{\text{2}}\text{(}g\text{)}$

Calculate the pressure in atm of ${\text{CO}}_{\text{2}}$ in an equilibrium process (a) at $\text{25}°\text{C}$ and (b) at $\text{800}°\text{C}\text{.}$ Assume that $\Delta H\text{° = 177}\text{.8 kJ/mol and }\Delta S°\text{ = 160}\text{.5 J/K }·\text{ mol}$ for the temperature range.