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PART 1:
Given that,
Work done,
According to First law of thermodynamics, Heat energy is given by,
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PART 2:
We know that, Work done is given by,
Where, is change in volume.
If the reaction happened at constant volume then, change in volume will be zero. Hence, work done will be zero.
Therefore, According to First law of thermodynamics, Heat energy is given by,
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