AP Chemistry Question 31: Answer and Explanation

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Question: 31

8. PCl3(g) + Cl2(g) ↔ PCl5(g) ΔH = -92.5 kJ/mol

In which of the following ways could the reaction above be manipulated to create more product?

  • A. Decreasing the concentration of PCl3
  • B. Increasing the pressure
  • C. Increasing the temperature
  • D. None of the above

Correct Answer: B


B Increasing the pressure in an equilibrium reaction with any gas molecules causes a shift to the side with less gas molecules-in this case, the product.