Direction of Reversible Reactions

AP Chemistry· difficulty 4/5

For N2_2 + 3H2_2 ⇌ 2 NH3_3, Kc_c = 0.50 at 400°C. If [N2_2]=1.0, [H2_2]=2.0, [NH3_3]=0.50, the system

  • A

    Shifts left (Q > K)

  • B

    Is at equilibrium

  • C

    Cannot be determined

  • D

    Shifts right (Q < K)

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Explanation

Q = [NH3_3]2^2/([N2_2][H2_2]3^3) = (0.50)2^2/((1.0)(2.0)3^3) = 0.25/8 = 0.031. Q < K (0.031 < 0.50), so reaction shifts right toward products.

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