A reaction energy profile shows reactants at and products at

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

A reaction energy profile shows reactants at

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

and products at

-40\,\text{kJ mol}^{-1}

. Which statement best describes the enthalpy change for the reverse reaction? (a) The reverse reaction is exothermic with

\Delta H = -40\,\text{kJ mol}^{-1}

. (b) The reverse reaction is exothermic with

\Delta H = +40\,\text{kJ mol}^{-1}

. (c) The reverse reaction is endothermic with

\Delta H = +40\,\text{kJ mol}^{-1}

. (d) The reverse reaction is endothermic with

\Delta H = -40\,\text{kJ mol}^{-1}