MolSynapsequestion bank

MolSynapse / Question bank / Thermodynamics and Thermochemistry / Heat capacities and their relations

JEE Main levelSingle correct optionDifficulty 2 of 3td186

Argon (molar mass $40 g mo l^{- 1}$ ) behaves as a monatomic ideal gas. Taking $R = 8.314 J mo l^{- 1} K^{- 1}$ , its specific heat capacity at constant pressure is nearest to

A $0.52 J g^{- 1} K^{- 1}$
B $0.31 J g^{- 1} K^{- 1}$
C $20.79 J g^{- 1} K^{- 1}$
D $0.73 J g^{- 1} K^{- 1}$

Answer: A

For a monatomic gas

C_{P} = 5 R /2 = 20.79 J mo l^{- 1} K^{- 1}

. Dividing by the molar mass gives

c_{P} = 20.785/40 = 0.520 J g^{- 1} K^{- 1}

, about 0.52.

Practice Thermodynamics and Thermochemistry More on Heat capacities and their relations

Previous questionNext question

More questions on Heat capacities and their relations