The gas-phase reaction has and at 298 ,K

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

Problem

The gas-phase reaction

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

has

\Delta H^{\circ} = 57.2\,\text{kJ mol}^{-1}

and

\Delta S^{\circ} = 176\,\text{J mol}^{-1}\,\text{K}^{-1}

at 298\,K. What is the equilibrium constant

K

for the reaction at 298\,K? (a) 6.8 (b) 0.15 (c) 1.0 (d) 0.015