Table of contents

16. Chemical Equilibrium

Equilibrium Constant Calculations

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Multiple Choice

Given the equilibrium reaction CO2(g) ⇌ CO2(aq) with an equilibrium constant Kc of 0.83, what is the concentration of aqueous CO2 if the concentration of gaseous CO2 is 1.0 M?

1.2 M

1.0 M

0.50 M

0.83 M

Verified step by step guidance

Identify the equilibrium expression for the reaction CO2(g) ⇌ CO2(aq). The equilibrium constant expression Kc is given by:

\frac{{CO 2}_{(aq)}}{{CO 2}_{(g)}}

Substitute the known values into the equilibrium expression. You know that Kc = 0.83 and the concentration of CO2(g) is 1.0 M.

Set up the equation using the equilibrium expression:

\frac{x}{1.0} = 0.83

, where x is the concentration of CO2(aq).

Solve for x, which represents the concentration of CO2(aq). Rearrange the equation to isolate x:

x = 0.83 	imes 1.0

Calculate the value of x to find the concentration of CO2(aq).

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