Which of the following reactions involving gases would be the forward - ProProfs Discuss

# Which of the following reactions involving gases would be the forward reaction favored by an increase in pressure?

A. A + B ↔ AB
B. A + B ↔ C + D
C. 2A + B ↔ C + 2D
D. AC ↔ A + C
Asked by Jayden, Last updated: Jan 19, 2020

This question is part of

STAR - Reaction Rates and Equilibrium

#### N. Kingsley

N. Kingsley, Writer, Columbus

The correct answer to this question is A. When dealing with pressure, you need to count the number of moles on both sides of the equation. If there is an increase in pressure, the reaction favors the direction with the lower number of moles.

If there is a decrease in pressure, the reaction will favor the direction with more moles of molecules. Because there are 2 moles of substance on the left and 1 on the right, if the pressure is increased, the reaction will favor the side with less number of moles of molecules, which in this case is the forward reaction.

John Smith