Question

The thermal dissociation equilibrium of $CaC{O}_3\left(s\right)$ is studied under different conditions
$CaC{O}_3\left(s\right)\rightleftharpoons CaO\left(s\right)+C{O}_2\left(g\right)$
For this equilibrium, the correct statement(s) is/are :

• A. $\Delta H$ is dependent on $T$
• B. $K$ is independent of the initial amount of $CaC{O}_3$
• C. $K$ is dependent on the pressure of $C{O}_2$, at a given $T$
• D. $\Delta H$ is independent of catalyst, if any

Answer 1

Answer: (A), (B), (D)

$\Delta H$ is independent of catalyst, if any

(A) $\Delta H=C_{p\left(rxn\right)}\Delta T$
Hence, enthalpy depends upon temperature

(B) $CaC{O}_3\left(s\right)\rightleftharpoons CaO\left(s\right)+C{O}_2\left(g\right)K_p=P_C{O}_2$

(C) $K_{eq}$, depends only on temperature and not on Pressure.

(D) Enthalpy of reaction is independent of the catalyst. Catalyst generaly changes activation energy.