The vapour pressure of a pure substance at various temperatures is presented below. T (°C)     Pvap (mmHg) 0.0 15.0 15.0 38.4 25.0 68.2 40.0 150.6 60.0 387.6 80.0 896.3 Calculate H°vap for this substance. What is the substance's normal boiling point?

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