Q.

For the process,

H2O(l,TK,Pbar)H2O(g,TK,Pbar)

Identify the option which is not correct.

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a

Only (a) and (c) are correct

b

ΔG>0 if P is greater than vapour pressure of H2O at TK

c

ΔG=0 if P represents vapour pressure of H2O at TK.

d

ΔG<0 if P represents vapour pressure of H2O at temperature greater than T K.

answer is B.

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Detailed Solution

ΔG = −ve,

When P = vapour pressure of H2O(l) at a temperature above T K.

When atmospheric pressure = vapour pressure of liquid and,

Temperature > boiling point

Then liquid spontaneously boils as well as free energy change is negative.

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