For the gas-phase equilibrium ( at 700 ,K)

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

For the gas-phase equilibrium

2\,\mathrm{SO_2(g)}+\mathrm{O_2(g)} \rightleftharpoons 2\,\mathrm{SO_3(g)}

(

K_p=3.0\times10^{4}

at 700\,K), three different mixtures (A–C) are prepared at 700\,K. • Mixture A:

P_{\text{SO}_2}=0.10\,\text{atm}

P_{\text{O}_2}=0.10\,\text{atm}

P_{\text{SO}_3}=0.50\,\text{atm}

• Mixture B:

P_{\text{SO}_2}=1.0\,\text{atm}

P_{\text{O}_2}=0.75\,\text{atm}

P_{\text{SO}_3}=0.10\,\text{atm}

• Mixture C:

P_{\text{SO}_2}=0.050\,\text{atm}

P_{\text{O}_2}=0.050\,\text{atm}

P_{\text{SO}_3}=2.0\,\text{atm}

Which of the following orders the mixtures from the strongest driving force toward formation of SO

_3

(rightward shift) to the strongest driving force toward decomposition of SO

_3

(leftward shift)? (a)

\text{C} > \text{A} > \text{B}

(b)

\text{B} > \text{A} > \text{C}

(c)

\text{B} > \text{C} > \text{A}

(d)

\text{A} > \text{B} > \text{C}