The mechanism for the conversion of compound P to compound S consists of the…

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

The mechanism for the conversion of compound P to compound S consists of the following elementary steps: P → Q ΔH = +40 kJ Q → R ΔH = −70 kJ R → S ΔH = −15 kJ Based on these values, what is the overall enthalpy change, ΔHrxn∘\Delta H^{\circ}_{\text{rxn}}, for the reaction P → S ? (a) −30 kJ-30\ \text{kJ} (b) −45 kJ-45\ \text{kJ} (c) +40 kJ+40\ \text{kJ} (d) −15 kJ-15\ \text{kJ}

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