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    Nisha Solanki's Avatar
    Nisha Solanki Posts: 34, Reputation: 1
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    #1

    Nov 28, 2014, 06:15 AM
    Why at constant volume ?
    Hello Everyone,
    You know Internal Energy (U) that is the total energy of a particle or a substance in chemistry.
    Its a fact that "Change in heat at constant volume is equal to the difference between internal energy of the reactant and the internal energy of the product." But I can't get it why at constant volume. Why there is need of constant volume ? Can someone please explain me ? Is my question clear to you all ?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 1, 2014, 12:49 PM
    Constant volume is required because otherwise the system does work as its volume expands, which would reduce the internal energy of the final product.
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