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Mole Concept and Avogadro's Number

One mole of a...

Question

One mole of a gas absorbs $200 J$ of heat at constant volume. Its temperature rises from $298 K$ to $308 K$ . The change in internal energy is-

A

200 J

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B

- 200 J

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C

- 400 J

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D

- 300 J

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Solution

The correct option is A $200 J$
$Δ U = Q + W$
$W = P Δ V$
As volume is constant ∆V = 0
Therefore W = 0 this implies
∆U = Q
Therefore $Δ U = 200 J$

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