For a two-step reaction

CHEMISTRY · Subjective · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

For a two-step reaction, the reactants are assigned 0 kJ·mol⁻¹, the intermediate lies at 25 kJ·mol⁻¹, and the products lie at −40 kJ·mol⁻¹. Calculate the overall enthalpy change ΔH (in kJ·mol⁻¹) for the reaction.

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