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Enthalpy, Heat of Formation and Heat of Vaporization

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1. Consider this data for compound X:
ΔHf 505.4 J/g ΔHvap= 3489J/g
Specific heat: X (s) = 0.96 J/g °C, X (1) = 3.88 J/g °C, X (g) = 1.21 J/g °C
Normal boiling point: 46.8 °C Normal freezing point: - 29.8 °C
a. Calculate the total energy change if 10.0 grams of X is changed from 11.0 °C to 88.9 °C.
b. Write out the chemical equation to which ΔHvap = 3489 J/g refers.

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Solution Summary

This solution explains how to calculate the energy required to take a compound through a series of transitions between a liquid and a gas. Heat of vaporization is used along with the specific heat of the compound in the liquid and gaseous phases.

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Part A
If compound X is at 11.0 °C, it is a liquid (it melts at -29.8 °C and doesn't boil until 46.8 °C). The compound ...

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