Chemistry

Problem

At 298 K the equilibrium constant for

\mathrm{N_2O_4}(g) \rightleftharpoons 2\,\mathrm{NO_2}(g)

K_c = 0.36

. A reaction mixture is prepared with

[\mathrm{N_2O_4}] = 0.15\,\text{M}

and

[\mathrm{NO_2}] = 0.60\,\text{M}

. Which statement correctly compares

Q_c

with

K_c

and predicts the spontaneous direction of shift? a)

Q_c < K_c

; the mixture will shift toward

\mathrm{NO_2}

. b)

Q_c > K_c

; the mixture will shift toward

\mathrm{N_2O_4}

. c)

Q_c = K_c

; the mixture is already at equilibrium. d)

Q_c > K_c

; the mixture will shift toward

\mathrm{NO_2}