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Q.

If work done by a gas is 142.8 J when heat given to the gas in isobaric process is 500 J, then the gas is ____

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a

O2

b

NH3

c

He

d

SO2

answer is A.

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Detailed Solution

W=PV2-V1=nRT2-nRT1 T2-T1=WnR Q=nCpT2-T1 500=nCpWnR;500=CpWR;Cp=500R142.5=3.5R=72RTherefore, the gas is diatomic.
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If work done by a gas is 142.8 J when heat given to the gas in isobaric process is 500 J, then the gas is ____