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Gibbs Free Energy & Spontaneity

What is the f...

Question

What is the free energy change $(△ G)$ when 1.0 mole of water at $100^{o} C$ and 1 atmospheric pressure is converted into steam at $100^{o} C$ 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 :
$1 m o l e o f w a t e r a t 100^{0} C a n d 1 a t m \to S t e a m a t 100^{0} C a t 1 a t m$

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.

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