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A cylinder of fixed capacity (of 44.8 L)...

A cylinder of fixed capacity (of 44.8 L) contains 2 moles 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` ? `("Use"R=8.31J"mol"^(-1)K^(-1))`

A

496J

B

495J

C

502J

D

499J

Text Solution

Verified by Experts

The correct Answer is:
D
Since volume=constant
`triangleU=nC_(v)triangleT`
`=3/2 xx 2 xx 8.31 xx 20`
=498.6 Joule
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Knowledge Check

  • A cylinder of fixed capacity 67 .2 litres contains helium gas at STP. Th~ amount of heat needed to rise the temperature of the gas in the cylinder by 20 °C is (R = 8.31 J mol^(-1)K^(-1) )

    A
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    B
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    C
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    D
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    B
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    C
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    D
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