A student calculated the energy of an unknown product bond and obtained a value of

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

A student calculated the energy of an unknown product bond and obtained a value of 340 kJ mol−1340\,\text{kJ mol}^{-1}. Later, the student realized that one of the product bonds had been omitted from the calculation, and including it would make the overall reaction enthalpy more exothermic. Without performing a new calculation, state whether the true bond energy of the unknown bond is greater than, less than, or equal to 340 kJ mol−1340\,\text{kJ mol}^{-1} and briefly explain your reasoning in one sentence.

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