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 20.0 g sample of ethanol initially at a temperature of 13.6oC.
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.
energy= mass*Lf+ mass*c*deltaTemp
look at the units of the constants.
Hv is in kJ per mole.
now, for the first term, convert 20g ethanol to moles ethanol, and you have it.posted by bobpursley
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