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AP Chemistry/Unit 7: Equilibrium
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Effect Of A Noble Gas On Equilibrium

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Consider the following reaction at equilibrium: 2NH3(g)⇌N2(g)+3H2(g)\mathrm{2NH_3(g)} \rightleftharpoons \mathrm{N_2(g)} + 3\mathrm{H_2(g)}. What is the effect on the equilibrium position if a noble gas is added to the system under conditions of constant pressure and, separately, under conditions of constant volume?

A

At constant pressure, the equilibrium remains unchanged; at constant volume, there is a shift to the left.

B

At constant pressure, the equilibrium shifts to the left; at constant volume, the equilibrium shifts to the right.

C

The addition of a noble gas has no effect under either condition.

D

At constant pressure, the equilibrium shifts to the right; at constant volume, there is no shift.

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