Question

A piston-cylinder device initially contains 0.3 kg of nitrogen gas at 160 kPa and 140oC. The nitrogen is now expanded isothermally to a pressure of 100 kPa. Determine the boundary work done during this process.

Answer 1

Work done by the gas is given as

`W = 1.72 * 10^4 J`

Step-by-step explanation:

As we know that the process is isothermal so here work done is given as

`W = nRTln((P_1)/(P_2))`

here we know that

`n = (w)/(M)`

`n = (300)/(28) = 10.7 moles`

now we have

`W = 10.7 (8.31)(273 + 140) ln((160)/(100))`

so we have

`W = 1.72 * 10^4 J`