March 28, 2017

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Ethanol (C2H5OH) boils at a temperature of 78.3oC.
What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 13.1 g sample of ethanol initially at a temperature of 11.1oC.

The specific heat of ethanol is approximately constant at 2.44 JK-1g-1
The heat of vaporization of ethanol is 38.56 kJ mol-1.

  • Chemistry - ,

    q1 = heat to raise T from 11.1 to 78.3 C.
    q1 = mass x specific heat x (Tfinal-Tinitial).

    q2 = heat to vaporize ethanol.
    q2 = mass x deltaHvap.

    Total = sum q1 + q2

  • Chemistry - ,


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