The vapour pressure of a pure substance at various temperatures is presented below. T (°C)     Pvap (mmHg) 0.0 10.5 15.0 18.6 25.0 26.4 40.0 42.8 60.0 76.2 80.0 127.0 a) Calculate H°vap for this substance. b)What is the substance's normal boiling point?

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