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# Entropy change of surroundings for the process: l -> g

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Substance X has a heat of vaporization of 55.4 kJ/mol at its normal boiling point (423°C). For the process X (l) -> X (g) at 1 atm and 423°C calculate the value of change of Suniv*

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#### Solution Preview

In calculation of entropy changes we must consider the entropy of system and the surroundings. Thus the total entropy change of the isolated system (delta S universe ) is taken as
delta S universe = delta S system+ delta S surroundings

Entropy change of system (delta S system) in reversible ...

#### Solution Summary

In calculation of entropy changes we must consider the entropy of system and the surroundings. Thus the total entropy change of the isolated system (delta Suniverse ) is taken as

delta S universe = delta S system+ delta S surroundings

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