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Question:

A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 200°C is:

374J

350J`

748J

700J

Solution:

ΔQ=nCVΔT=n(3/2)RΔT=(67.2/22.4)×(3/2×8.31)×(200)≈748J