Consider the following standard free-energy changes: Reaction I: X Y Reaction II: Y Z…

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

Problem

Consider the following standard free-energy changes: Reaction I: X

\rightarrow

\Delta G^{\circ}=+15.0\,\text{kJ}\,\text{mol}^{-1}

Reaction II: Y

\rightarrow

\Delta G^{\circ}=-32.0\,\text{kJ}\,\text{mol}^{-1}

What is

\Delta G^{\circ}

for the overall conversion X

\rightarrow

Z? (a)

+17.0\,\text{kJ}\,\text{mol}^{-1}

(b)

-17.0\,\text{kJ}\,\text{mol}^{-1}

(c)

-47.0\,\text{kJ}\,\text{mol}^{-1}

(d)

-32.0\,\text{kJ}\,\text{mol}^{-1}