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CLEP Chemistry Practice Test

Category - Chemistry

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The reduction of carbon dioxide by hydrogen gas takes place at 420°C to produce water vapor and carbon monoxide. The equation for this reaction at equilibrium is shown below.

H2(g) + CO2(g) ↔ H2O(g) + CO(g).

Which of the following changes in concentration occur when more water vapor is added to the system under equilibrium conditions?
  1. [H2] decreases, [CO2] decreases, [CO] increases
  2. [H2] decreases, [CO2] decreases, [CO] increases
  3. [H2] increases, [CO2] increases, [CO] decreases
  4. [H2] increases, [CO2] increases, [CO] increases
Explanation

Answer: D - [H2] increases, [CO2] increases, [CO] increases

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The question was edited to fix choices 10/29/22 thanks to user feedback

 

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