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  3. AP Chemistry
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Calculating the Equilibrium Constant

Caleb Thomas

Caleb Thomas

9 min read

Study Guide Overview

This study guide covers calculating equilibrium constants (Kc and Kp). It explains the formulas, provides example calculations, and discusses the meaning of K values. The guide also includes tips for calculations, a sample AP question, and practice problems with an answer key. Key concepts include equilibrium, stoichiometric coefficients, partial pressures, and molar concentrations.

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Question 1 of 10

Given the reaction: N2(g)+3H2(g)⇌2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)N2​(g)+3H2​(g)⇌2NH3​(g), which of the following is the correct KcK_cKc​ expression? 🎉

Kc=[N2][H2]3[NH3]2K_c = \frac{[N_2][H_2]^3}{[NH_3]^2}Kc​=[NH3​]2[N2​][H2​]3​

Kc=[NH3]2[N2][H2]3K_c = \frac{[NH_3]^2}{[N_2][H_2]^3}Kc​=[N2​][H2​]3[NH3​]2​

Kc=[NH3][N2][H2]K_c = \frac{[NH_3]}{[N_2][H_2]}Kc​=[N2​][H2​][NH3​]​

Kc=[N2][H2][NH3]K_c = \frac{[N_2][H_2]}{[NH_3]}Kc​=[NH3​][N2​][H2​]​