Q.

When an ideas gas (r = 7/3) is heated under constant pressure, then what percentage of given heat energy will be utilised is doing external work

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a

43%

b

57%

c

29%

d

40%

answer is B.

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Detailed Solution

ΔQ=ΔU+ΔW⇒ΔWΔQ=1−ΔUΔQ⇒ΔWΔQ=1−nCvΔTnCvΔT=1−37=47≈0.57
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When an ideas gas (r = 7/3) is heated under constant pressure, then what percentage of given heat energy will be utilised is doing external work