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The normal boiling point of liquid hexane is 342 K.Assuming

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The normal boiling point of liquid hexane is 342 K.Assuming that its molar heat of vaporization is constant at 31.0 kJ/mol,the boiling point of C6H14 when the external pressure is 0.769 atm is K.
标准状态下己烷的沸点是342K.假设他的摩尔汽化热是31.0KJ/mol,当外界压力为0.769个标准大气压的时己烷的沸点是多少?
高中化学都忘光了,反正是用能量守恒算