The value of γ for diatomic gas is_______________?
Correct answer: B. 1.4
- A. 1.67
- B. 1.4
- C. γ = 1.3
- D. None
Explanation
For a diatomic ideal gas at ordinary temperatures, gamma = Cp/Cv = 7/5 = 1.4 because the molecules have translational and rotational degrees of freedom. The likely mistake is choosing 1.67, which is the approximate value for a monatomic ideal gas.
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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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