Chemistry

Problem

298\,\text{K}

the equilibrium constant

K_c

for the reaction

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

4.5\times10^{-3}

. The reaction enthalpy is

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

(per mole of

\mathrm{N_2O_4}

consumed). Using

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

, determine the value of

K_c

350\,\text{K}