_________ is a thermodynamic potential which measures the useful work obtainable from a closed thermodynamic system at a constant temperature and volume.

Useful work

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Energy consumed

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Helmholtz free energy

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Kinetic energy

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Solution

The correct option is C Helmholtz free energy
Helmholtz free energy is a thermodynamic potential which measures the useful work obtainable from a closed thermodynamic system at a constant temperature and volume.
The helmholtz energy is defined as :
$A = U - T S$
where, $A \to$ helmholtz free energy
$U \to$ Internal energy of the system
$T \to$ Temperature of surroundings (in kelvin)
$S \to$ Entropy of the system

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