The reaction has and

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

Problem

The reaction

N_2\, (\text{g}) + 3\, H_2\, (\text{g}) \rightleftharpoons 2\, NH_3\, (\text{g})

has

\Delta H^\circ = -92.5\,\text{kJ}\,\text{mol}^{-1}

and

\Delta S^\circ = -198\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

, both assumed temperature-independent. Using

R = 8.314\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}

, what is the equilibrium constant

K

350\,\text{K}

? (a)

5.6 \times 10^{1}

(b)

3.0 \times 10^{3}

(c)

9.0 \times 10^{7}

(d)

3.5 \times 10^{-4}