A piston-cylinder device initially contains 0.4 m3 of air

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A piston-cylinder device initially contains 0.4 m³ of air (to be treated as an ideal gas) at 100 kPa and 80°C. The air is now isothermally compressed to 0.1 m³. The work done during this process is ______kJ.
(Take the sign convention such that work done on the system is negative)

1. 55.45 kJ
2. -21.45 kJ
3. -55.45 kJ
4. -15.45 kJ

Correct Option: C

For isothermal process

W = P₁V₁ln		V₂
		V₁

W = 100 × 0.4 ln		0.1		= -55.45 kJ
		0.4