Volume/Pressure Stress via Q vs. K
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State
Compressing a gas equilibrium raises every concentration, changing Q unless gas moles are equal on both sides, so it shifts toward the side with fewer moles.
Show
Compressing N2 + 3 H2 ⇌ 2 NH3 shifts the mixture toward NH3, the side with fewer gas moles.
Watch for
Equal gas moles on both sides means no shift from a volume change, since Q never moves.