InterviewSolution
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InterviewSolution
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Piston cylinder device initially contains `0.5m^(3)` of nitrogen gas at `400 kPa` and `27^(@)C`. An electric heater within the device is turned on and is allowed to apss a current of `2 A` for `5 mi n` from a `120 V` source. Nitrogen expands at constant pressure and a heat loss of `2800 J` occurs during the process. `R=25//3 kJ //k mol - K` Electric work done on the nitrogen gas isA. `72 kJ`B. `36 kJ`C. `118 kJ`D. `9kJ` |
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Answer» Correct Answer - A Electric work done on the nitrogen `W_(e)=-Delta VIDeltaT` `=-120 xx 2 xx 5 xx 60=72 xx 10^(3)J` `=-72 kJ` `(` Negative sign is added because the work is done on the system `)`. |
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