Half mole of an ideal monoatomic gas is heated at a constant pressure of 1 atm from 20 ° C to 90 ° C . Work done by the gas is ( Gas constant, R = 8.21 J mol - 1 K - 1 )

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Recall the formula of work done in terms of change in volume and pressure, in the case of isobaric process, where pressure is constant, $W = P V_{2} - P V_{1}$ , now take the idea of ideal gas equation,
$W = n R T_{2} - n R T_{1}$ $= \frac{1}{2} \times 8.31 (70)$ $= 291 J$ .

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