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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−nRT1T2−T1=WnRQ=nCpT2−T1500=nCpWnR500=CpWRCp=500R142.5=3.5R=7/2RHence, gas is diatomic O2
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