A cylinder with fixed capacity of 67.2 lit contains helium gas at STP.

1.	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 20°C is: [Given that R = 8.31 J mol⁻¹ K⁻¹](A) 350 J (B) 700 J(C) 748 J (D) 374 J
Answer» The amount of heat NEEDED to RAISE the temperature of GAS by 20°c is 748J Given 1.capacity of cylinder is 67.2 litre R=8.31 J mol⁻¹ K⁻¹ 2.Q=nCvΔT now n=67.2/22.4 He is MONOATOMIC gas so cv=f/2R=3/2R Q=67.2/22.43/2R20=748J

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 20°C is: [Given that R = 8.31 J mol⁻¹ K⁻¹](A) 350 J (B) 700 J(C) 748 J (D) 374 J

Answer»

The amount of heat NEEDED to RAISE the temperature of GAS by 20°c is 748J

Given

1.capacity of cylinder is 67.2 litre

R=8.31 J mol⁻¹ K⁻¹

2.Q=nCvΔT

now n=67.2/22.4

He is MONOATOMIC gas

so cv=f/2R=3/2R

Q=67.2/22.4*3/2R*20=748J

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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 20°C is: [Given that R = 8.31 J mol⁻¹ K⁻¹](A) 350 J (B) 700 J(C) 748 J (D) 374 J

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