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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 ]

1. 748 J
2. 350 J
3. 374 J
4. 700 J

Correct answer: 748 J

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