Discussion
Match each change with its effect on a gas phase reaction that produces fewer moles than it consumes.
List I
A. Raising the pressure
B. Adding an inert at constant volume
C. Adding an inert at constant pressure
D. Removing a product continuously
List II
1. shifts the equilibrium towards reactants
2. shifts the equilibrium towards products
3. shifts the equilibrium towards products
4. leaves the equilibrium unchanged
Answer: B
Correct answer: A-2, B-4, C-1, D-3
A reaction producing fewer moles is helped by anything that raises the concentration of the gas. Raising the pressure does so, shifting towards products. An inert added at constant volume changes no partial pressure of a reacting species, so nothing shifts. An inert added at constant *pressure* expands the volume and dilutes everything, which acts like a reduction in pressure and shifts towards reactants. And removing a product continuously drives the reaction forward.
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