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Question

For the process, H2O(l)H2O(g) at T=100C and 1 atmosphere pressure, the correct choice

A
ΔSsystem>0 and ΔSsurrounding>0
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B
ΔSsystem>0 and ΔSsurrounding<0
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C
ΔSsystem<0 and ΔSsurrounding>0
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D
ΔSsystem<0 and ΔSsurrounding<0
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Solution

The correct option is B ΔSsystem>0 and ΔSsurrounding<0
This problem is based on assumption that total entropy change of universe is zero.
At 100C and 1 atmosphere pressure,
H2OH2O(g) is at equilibrium.
For equilibrium, ΔStotal=0
and ΔSsystem+ΔSsurrounding=0
As we know during conversion of liquid to gas entropy of system increases, in a similar manner entropy of surrounding decreases.
ΔSsystem>0 and ΔSsurrounding<0

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