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Half mole of ...

Question

Half mole of an ideal monoatomic gas is heated at constant pressure of 1 atm from $20^{o} C$ to $90^{o} C$ . Work done by gas close to : (Gas constant R = 8.31 J / mol. K)

A

73 J

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B

291 J

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C

581 J

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D

146 J

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Solution

The correct option is C 581 J
Work Done = $P Δ V = n R Δ T = 1 \times 8.31 \times (90 - 20) = 581 J$

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