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  4. A gas occupies 2 litre at STP. It is provided 300J heat so that its volume becomes 2.5 litre at 1atm . Calculate change in internal energy.

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Q. A gas occupies $2$ litre at STP. It is provided $300J$ heat so that its volume becomes $2.5$ litre at $1atm$ . Calculate change in internal energy.

NTA AbhyasNTA Abhyas 2020

Solution:

$\boxed{ΔE = q + w}$
$ΔE=300-1\left(2 . 5 - 2\right)101.3$
$=300-0.5\times 101.3$
$\boxed{ΔE = 249 . 5 J}$