Chemistry

Problem

For the reaction

2\,\mathrm{CO}(g) + \mathrm{O_2}(g) \rightarrow 2\,\mathrm{CO_2}(g)

, the standard Gibbs free energy change at 298 K is

\Delta G^\circ = -514\,\text{kJ}

. What is

\Delta G^\circ

for the reaction

\mathrm{CO}(g) + \tfrac12\,\mathrm{O_2}(g) \rightarrow \mathrm{CO_2}(g)

at the same temperature? a)

-514\,\text{kJ}

-1.028\times10^{3}\,\text{kJ}

-257\,\text{kJ}

+257\,\text{kJ}