Chapter 18, Problem 73QP

Consider the thermal decomposition of ${\text{CaCO}}_{\text{3}}$:

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

The equilibrium vapor pressures of ${\text{ CO}}_{\text{2}}$ are 22.6 mmHg at $700°\text{C}$ and 1829 mmHg at $\text{950°C}$. Calculate the standard enthalpy of the reaction. [Hint: See Problem 18.66(a).]