Problem: Which of the following reactions would shift to favor the reactant side by doubling the volume of the container?A. CaCO3 (s) ⇌ CaO (s) + CO2 (g)B. Cl2 (g) + I2 (g) ⇌ 2 ICl (g)C. 2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g)D. all of the aboveE. none of the above

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We’re being asked to determine the reactions that would shift to favor the reactant side by doubling the volume of the container.


According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.

Doubling the volume of the container (increasing the total volume) is the same as decreasing the total pressure. (Recall Boyle’s Law)

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Problem Details

Which of the following reactions would shift to favor the reactant side by doubling the volume of the container?

A. CaCO3 (s) ⇌ CaO (s) + CO2 (g)

B. Cl2 (g) + I2 (g) ⇌ 2 ICl (g)

C. 2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g)

D. all of the above

E. none of the above

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