Multiple Choice
The equilibrium constant, K, for 2 NO (g) + O2 (g) ⇌ 2 NO2 (g) is 6.9 x 102.
What is the [NO] in an equilibrium mixture of gaseous NO, O2, and NO2 at 500 K that contains 1.5 x 10 –2 M O2 and 4.3 x 10 –3 M NO2?
16. Chemical Equilibrium
Intro to Chemical Equilibrium
Multiple Choice
Which of the following statements about the equilibrium constant is false?
A
When adding chemical equations, multiply the equilibrium constants by each other to determine the overall equilibrium constant.
B
If the coefficients in an equation are multiplied by three, the equilibrium constant should also be multiplied by three.
C
The equilibrium constant of the reverse reaction is equal to the reciprocal of the equilibrium constant for the forward direction.
D
Doubling the amount of a solid in a reaction never has an effect on the equilibrium constant.
Verified step by step guidance1
Step 1: Understand the concept of the equilibrium constant (K). The equilibrium constant is a value that expresses the ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their stoichiometric coefficients.
Step 2: Review how equilibrium constants are affected by changes in chemical equations. When a chemical equation is reversed, the equilibrium constant for the reverse reaction is the reciprocal of the equilibrium constant for the forward reaction.
Step 3: Consider the effect of multiplying the coefficients in a chemical equation. If the coefficients in a balanced chemical equation are multiplied by a factor, the equilibrium constant is raised to the power of that factor, not multiplied by it.
Step 4: Examine the role of solids in equilibrium expressions. The concentration of pure solids and liquids does not appear in the expression for the equilibrium constant, so changing the amount of a solid does not affect the equilibrium constant.
Step 5: Analyze the statement about adding chemical equations. When adding chemical equations, the equilibrium constants are multiplied to find the overall equilibrium constant for the combined reaction.
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