Question

A frictionless piston-cylinder based enclosure contains some amount of gas at a pressure of 400 kPa. Then heat is transferred to the gas at constant pressure in a quasi-sta ic process. The piston moves up slowly through a height of 10cm. If the piston has a cross-section area of $0.3m^2$, the work done by the gas in this process is

• A. 6 kJ
• B. 12 kJ
• C. 7.5 kJ
• D. 24 kJ

Answer 1

The correct option is B 12 kJ

The work done by gas in moving piston up by some height $h$ at constant volume is
$P\Delta V=P\left(A\Delta h\right)$

$=400kPa\times 0.3m^2\times 0.1m$
$=12kJ$