Substance X has at its boiling point

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

Problem

Substance X has ΔHvap=31 kJ mol−1\Delta H_{\text{vap}} = 31\,\text{kJ}\,\text{mol}^{-1} at its boiling point. A separate process involving X releases 125 kJ mol−1125\,\text{kJ}\,\text{mol}^{-1}. Is the 125 kJ mol−1125\,\text{kJ}\,\text{mol}^{-1} process more likely a phase change of X or a chemical reaction? Support your conclusion in one sentence.

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