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Question

Increasing internal energy of a system __________ the helmholtz free energy at constant TS.

A
increases
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B
decreases
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C
remains constant
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D
none of these
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Solution

The correct option is C increases
Helmholtz free energy is given by A=UTS where U=internal energy, T=temperature, S=entropy
When TS is constant
When internal energy increases, helmholtz free energy increases
When internal energy decreases, helmholtz free energy decreases (from the equation)

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