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Question

For the process:
H2O(l) (1 bar, 373 K)H2O(g) (1 bar, 373 K)
the correct set of thermodynamic parameters is:

A
ΔG>0, ΔS=+ve
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B
ΔG=0, ΔS=+ve
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C
ΔG=+ve, ΔS=0
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D
ΔG=ve, ΔS=+ve
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Solution

The correct option is B ΔG=0, ΔS=+ve
This is a phase transformation and hence, ΔG=0. Since, H2O(l) is changing to H2O(g) at the same temperature and pressure, ΔS=+ve.

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