At four reactions have the following standard free-energy changes: • Reaction 1: •…

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

298\,\text{K}

four reactions have the following standard free-energy changes: • Reaction 1:

\Delta G^{\circ}=+5.7\,\text{kJ mol}^{-1}

• Reaction 2:

\Delta G^{\circ}=0\,\text{kJ mol}^{-1}

• Reaction 3:

\Delta G^{\circ}=-1.2\,\text{kJ mol}^{-1}

• Reaction 4:

\Delta G^{\circ}=-20\,\text{kJ mol}^{-1}

Assuming

RT\,\approx\,2.48\,\text{kJ mol}^{-1}

at this temperature, which statement best describes the relative magnitudes of the equilibrium constants? (a)

K_4 > K_3 > K_2 > K_1

(b)

K_4 \gg K_3 \approx K_2 > K_1

(c)

K_4 > K_2 \gg K_3 > K_1

(d)

K_1 > K_2 \approx K_3 > K_4