For ideal polyatomic gas molar specific heat is equal to:
Correct answer: A. 24.9 J/mol·K
- A. 24.9 J/mol·K
- B. 12.9 J/mol·K
- C. 15 J/mol·K
- D. 16 J/mol·K
Explanation
For a non-linear polyatomic gas, there are 3 translational and 3 rotational degrees of freedom (f=6). The molar specific heat at constant volume is Cv = (f/2)R = (6/2)R = 3R. Using R ≈ 8.314 J/mol·K, Cv ≈ 3 × 8.314≈24.9 J/mol·K.
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About Molar Specific Heat of a Gas
Molar specific heat is the heat required to raise the temperature of one mole of a gas by one kelvin, expressed through Q = nCΔT. Questions compare the constant volume value Cv with the constant pressure value Cp, apply the ideal gas relation Cp − Cv = R, and identify how the thermodynamic process affects heat capacity.
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