Chemistry

Chemistry

Problem

The table lists standard Gibbs free-energy changes for three reactions. 1) P + Q →\rightarrow R ΔG∘=+28 kJ\Delta G^{\circ}=+28\,\text{kJ} 2) R →\rightarrow S + T ΔG∘=−40 kJ\Delta G^{\circ}=-40\,\text{kJ} 3) 2 S →\rightarrow P ΔG∘=+5 kJ\Delta G^{\circ}=+5\,\text{kJ} Using only these reactions, determine ΔG∘\Delta G^{\circ} for the overall reaction Q + S →\rightarrow T under standard conditions. a) +7 kJ+7\,\text{kJ} b) −12 kJ-12\,\text{kJ} c) −7 kJ-7\,\text{kJ} d) −17 kJ-17\,\text{kJ}

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