Chemistry

Problem

298\,\text{K}

, a hypothetical reaction has

\Delta H^\circ = -125\,\text{kJ}\,\text{mol}^{-1}

and

\Delta G^\circ = -95\,\text{kJ}\,\text{mol}^{-1}

. Assuming

\Delta H

and

\Delta S

remain temperature-independent, above what temperature will the reaction cease to be spontaneous (

\Delta G

becomes positive)? a)

392\,\text{K}

770\,\text{K}

1240\,\text{K}

940\,\text{K}