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A cylinder of fixed capacity 67.2 litres...

A cylinder of fixed capacity 67.2 litres contains helium gas at STP. What amount of heat is required to raise the temperature of the gas by `25^@C`

Text Solution

Verified by Experts

We are given
Volume of He at S.T.P=67.2 litre and `Delta T=25^@C`
We are to calculate , heat required to raise the temperature
We know that,
Volume of 1 mole of He at STP =22.4 litre
`therefore` Number of moles of He n =`67.2/22.4=3`

Molar specific heat of he at constant volume
`C_v=3/2 R =3/2 times 8.31J//mol//k`
Heat required =`nC_v Delta T=3 times 3/2 times 8.31 times 25=934.88J`
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