A cylinder of fixed capacity 44.8litrescontainshelium gas at standard pressureat temperature . What is the amount of heat need to rest that temperature of the gas by 15.00^@C ? [ R = 8.31 " J mol"^(-1)K^(-1)]

A cylinder of fixed capacity 44.8litrescontainshelium gas at standard

1.	A cylinder of fixed capacity 44.8litrescontainshelium gas at standard pressureat temperature . What is the amount of heat need to rest that temperature of the gas by 15.00^@C ? [ R = 8.31 " J mol"^(-1)K^(-1)]
Answer» Solution :Volume of 1 mole of He at at S.T.P = 22.4 letres Total volume of He at S.T.P = 44.8 litres `:.` No of mole of He `n= (44.8)/(22.4)=2` MOLAR SPECIFIC heat of He (monoatomic gas) at CONSTANT volume , `C_V=3/2R=3/2xx8.31J mol^(-1) K^(-1)` `:. DELTAT = 15^@C = 15K` Here required `Q = nC_VDeltaT` `=2xx3/2xx8.31xx15` `=373.95J`