The constant pressure molar heat capacity of argon is 20.79 J K^-1 mol^-1 at 298 K. Predict the value of the constant volume molar heat capacity of argon at this temperature.

Question

Quizplus · Accepted Answer

The relationship between the constant pressure (Cp) and constant volume (Cv) molar heat capacities for an ideal gas is given by Cp - Cv = R, where R is the ideal gas constant (8.31 J K^-1 mol^-1). Given Cp for argon is 20.79 J K^-1 mol^-1, subtracting R from Cp gives Cv = 20.79 J K^-1 mol^-1 - 8.31 J K^-1 mol^-1 = 12.48 J K^-1 mol^-1.

The Constant Pressure Molar Heat Capacity of Argon Is 20