A reaction has an enthalpy change of

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

Problem

A reaction has an enthalpy change of ΔH=−75 kJ mol−1\Delta H= -75\,\text{kJ}\,\text{mol}^{-1}. Which of the following best describes the relative potential energies of the reactants and products in a reaction-progress energy diagram for this reaction? (a) The products lie 75 kJ mol−175\,\text{kJ}\,\text{mol}^{-1} higher in potential energy than the reactants. (b) The products lie 75 kJ mol−175\,\text{kJ}\,\text{mol}^{-1} lower in potential energy than the reactants. (c) The difference in potential energy cannot be determined without knowing the activation energy. (d) The products lie 150 kJ mol−1150\,\text{kJ}\,\text{mol}^{-1} lower in potential energy than the reactants.

Related theory

Browse the problem library