Calculating Equilibrium Concentrations

AP Chemistry· difficulty 4/5

For N2(g)+3H2(g)2NH3(g)N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g), Kc=1.0K_c = 1.0 at a given T. Starting with 2.0 M N₂, 2.0 M H₂, and 0 M NH₃, the direction of reaction at equilibrium will be

  • A

    Toward reactants since Q > K initially

  • B

    Toward products since Q < K initially

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  • C

    Cannot be determined without temperature

  • D

    No net change since Q = K

Explanation

Q = [NH₃]²/([N₂][H₂]³) = 0/(2 · 8) = 0. Q < K → forward.

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