---
title: "A sample of solid calcium carbonate, \\(\\text{CaCO}_3\\text{(s)}\\), is placed in a sealed, rigid container and heated to \\(1000\\text{ K}\\), decomposing according to the equation below:  \\[ \\text{CaCO}_3\\text{(s)} \\rightleftharpoons \\text{CaO(s)} + \\text{CO}_2\\text{(g)} \\]  Which of the following represents the correct equilibrium constant expression, \\(K_p\\), for this system?"
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url: "https://nerd-notes.com/ubq/119660/"
date_modified: "2026-08-21T08:11:58+00:00"
---

# A sample of solid calcium carbonate, \(\text{CaCO}_3\text{(s)}\), is placed in a sealed, rigid container and heated to \(1000\text{ K}\), decomposing according to the equation below:

\[ \text{CaCO}_3\text{(s)} \rightleftharpoons \text{CaO(s)} + \text{CO}_2\text{(g)} \]

Which of the following represents the correct equilibrium constant expression, \(K_p\), for this system?

A sample of solid calcium carbonate, \(\text{CaCO}_3\text{(s)}\), is placed in a sealed, rigid container and heated to \(1000\text{ K}\), decomposing according to the equation below:

\[ \text{CaCO}_3\text{(s)} \rightleftharpoons \text{CaO(s)} + \text{CO}_2\text{(g)} \]

Which of the following represents the correct equilibrium constant expression, \(K_p\), for this system?

- **A.** \(K_p = P_{\text{CO}_2}\)
- **B.** \(K_p = \dfrac{1}{P_{\text{CO}_2}}\)
- **C.** \(K_p = \dfrac{[\text{CaO}][\text{CO}_2]}{[\text{CaCO}_3]}\)
- **D.** \(K_p = \dfrac{P_{\text{CaO}}\,P_{\text{CO}_2}}{P_{\text{CaCO}_3}}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119660/*