Consider at 350 K

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

Consider

\text{N}_2\text{O}_4(g)\rightleftharpoons2\,\text{NO}_2(g)

at 350 K, for which

K_c=4.5\times10^{-3}

and

K_p=0.17

. A 1.50 L container at 350 K holds

0.040\,\text{mol}

\text{N}_2\text{O}_4

and

0.060\,\text{mol}

\text{NO}_2

. Which statement correctly compares the reaction quotients with their respective equilibrium constants and predicts the direction of change? (a)

Q_c>K_c

and

Q_p>K_p

; the system will shift toward products. (b)

Q_c>K_c

and

Q_p>K_p

; the system will shift toward reactants. (c)

Q_c=K_c

and

Q_p=K_p

; the system is already at equilibrium. (d)

Q_c>K_c

but

Q_p<K_p

; the direction cannot be predicted without additional data.

Related theory

Law of Mass Action
Chemical Equilibrium
Equilibrium
Equilibrium constant calculations
Equilibrium Constant

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