Questions

A cylinder of fixed capacity (of 44.8 L) contains 2 mol of helium gas at STP. What is the amount of
heat needed to raise the temperature of the gas in the cylinder by 20°C? (Take, R = 8.31J mol^-1K^-1)

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996 J

831 J

499 J

374 J

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detailed solution

Correct option is C

Since, the volume of cylinder is fixed and helium is a monoatomic gas.The internal energy = μCVΔT⇒ U=12fμRΔT ∵CV=12fRU=12×3×2×8.31×20 (∵f=3)=498.6≈499J

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