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29 a sample of argon gas at 1 atm and 27°c expands reversibly and adiabatically from 1.25 litre to 2.50 litre. the change in enthalpy approximately is (a) 11.5
29 A sample of Argon Gas at 1 atm and 27°C expands reversibly and adiabatically from 1.25 litre to 2.50 litre. The change in enthalpy approximately is (a) 11.5 Joule (b) 272 Joule (c)115 Joule (d) 0
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D s kumar Best Answer
Answer : - 114.5 J = - 115 J\n\nthe given options are wrong. In the option C, negative sign is not given. \nAlso the Cv Or the Cp value of Argon should be given. \nthe problem is solved in detail using the \nCv value = 12.48 J/K/mol.\nthus, the Cp value = Cv + R =\n 12.48 + 8.314 = 20.794 J/K/mol.