At $900^{\circ} \mathrm{C}, K_{\mathrm{C}}=0.0108$ for the reaction

$$\mathrm{CaCO}_{3}(s) \rightleftharpoons \mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$$

A mixture of $\mathrm{CaCO}_{3}, \mathrm{CaO},$ and $\mathrm{CO}_{2}$ is placed in a 10.0 - $\mathrm{L}$ vessel at $900^{\circ} \mathrm{C}$ . For the following mixtures, will the

amount of $\mathrm{CaCO}_{3}$ increase, decrease, or remain the same as the system approaches equilibrium?

\begin{equation}

\begin{array}{l}{\text { (a) } 15.0 \mathrm{g} \mathrm{CaCO}_{3}, 15.0 \mathrm{g} \mathrm{CaO}, \text { and } 4.25 \mathrm{gCO}_{2}} \\ {\text { (b) } 2.50 \mathrm{g} \mathrm{CaCO}_{3}, 25.0 \mathrm{g} \mathrm{CaO}, \text { and } 5.66 \mathrm{g} \mathrm{CO}_{2}} \\ {\text { (a) } 30.5 \mathrm{g} \mathrm{CaCO}_{3}, 25.5 \mathrm{g} \mathrm{CaO}, \text { and } 6.48 \mathrm{g} \mathrm{CO}_{2}}\end{array}

\end{equation}