For the reaction

CHEMISTRY · Numerical · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

For the reaction

3\mathrm{A}(g)+3\mathrm{B}(s)\to3\mathrm{C}(g)

, if

\Delta U^\circ=-20\ \mathrm{kJ}

and

\Delta S^\circ=-80\ \mathrm{J\,K^{-1}}

, find

\Delta G^\circ

298\ \mathrm{K}