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 pres

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.

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Thái Dương 3 years 2021-08-24T14:45:45+00:00 1 Answers 10 views 0

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  1. Jezebel
    0
    2021-08-24T14:46:53+00:00
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    Answer:

    Work done by the gas is given as

    W = 1.72 \times 10^4 J

    Explanation:

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

    W = nRTln(\frac{P_1}{P_2})

    here we know that

    n = \frac{w}{M}

    n = \frac{300}{28} = 10.7 moles

    now we have

    W = 10.7 (8.31)(273 + 140) ln(\frac{160}{100})

    so we have

    W = 1.72 \times 10^4 J

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