A certain ideal gas has a molar specific heat at constant volume of 20.8 J mol⁻¹ K⁻¹. What is its molar specific heat at constant pressure (R = 8.31 J mol⁻¹ K⁻¹)?
Correct answer A. 29.1 J mol⁻¹ K⁻¹
Explanation
For an ideal gas Cp = Cv + R = 20.8 + 8.31 ≈ 29.1 J mol⁻¹ K⁻¹. Subtracting R instead of adding it gives 12.5 J mol⁻¹ K⁻¹.
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