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Q.

The mass of a gas molecule can be computed from the specific heat at constant volume. Cv for argon is 0.075 kcal/kg K. The molecular weight of an argon atom is (R = 2 cal/molK).

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a

20 kg

b

40 kg

c

20×10−3kg

d

40×10−3kg

answer is B.

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Detailed Solution

Cv=3R2J/molK=3R2MJ/KgK=3R2M×4.2cal/kgK=0.075kcal/kgK

Molecular weight of argon atom

M=3R2M×4.2×0.075×103=3×2532×4.2×75=40×10−3kg

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