Question

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

• A. 73 J
• B. 291 J
• C. 581 J
• D. 146 J

Answer 1

Answer: (B)

291 J

Answer 2

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