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When heat energy of 1500J is supplied to...

When heat energy of 1500J is supplied to a gas the external work done on the gas is 525J. what is the increase in its internal energy.

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Heat energy supplied `Delta Q= +1500J`
Exernal work done `Delta w=525J`
By `1^(st)` law of thermodynamics `Delta Q= Delta U+Delta w`
:. `Delta U = Delta Q - Delta w = 1500+525 = 1025J`.
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