The change in internal energy when 20g of a gas is heated from 25^ C to 35^ C at constant volume is (Specific heat capacity of the gas at constant volume =0.2 calg^-1°C^-1 and (J=4200J/ kcal).

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Correct answer: D. (d) Mass of gas, m=20g Change in temperature, T=35^ C-25^ C=10^ C Specific heat capacity of the gas. C_v=0.2 calg^-1°C^-1 The change in internal energy is given by Q= U=mC_v T ( V=0 ;W=0 ) =20 0.2 10 4.200=168J

$The change in internal energy when 20 g of a gas is heated from 25^{\circ} C to 35^{\circ} C at constant volume is (Specific heat capacity of the gas at constant volume = 0.2 cal g^{- 1} ° C^{- 1} and (J = 4200 J / kcal) .$

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