What is the free energy change (△G) when 1.0 mole of water at 100oC and 1 atmospheric pressure is converted into steam at 100oC and 1 atmospheric pressure?
A
80 cal
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B
540 cal
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C
620 cal
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D
zero
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Solution
The correct option is D zero The required phase convertion is : 1moleofwaterat1000Cand1atm→Steamat1000Cat1atm
We know that phase conversions always occur at constant pressure ad temperature and the reaction is at equilibrium.
So the process at equilibrium the value of △G is zero.