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

Solution:

$WD = P\Delta V =nR\Delta T = \frac{1}{2} \times8.31 \times70$

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