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benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1c. at what temperature does benzene boil when the external pressure is 445 torr

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    The Clausius–Clapeyron relation is to be sued.

    Tb=(R ln (Po)/deltaH - 1/To)

    Po is 445torr (convert that)
    To is what you are looking for
    deltaHv given
    Tb=80.1C convert that to K

    R is universal gas constant. Watch units.

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