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Asked Feb 21, 2020
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Calculate the theoretical value of C_p (constant pressure heat capacity)/ C_v (constant volume heat capacity) for the following gases: Ar, CO_2, and N_2

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Expert Answer

Step 1

The molar specific heat capacity of a gas at constant volume (Cv) is the amount of heat required to raise the temperature of 1 mol of the gas by 1 °C at the constant volume.

The specific heat at constant volume is given as :

Chemistry homework question answer, step 1, image 1

 

The molar specific heat of a gas at constant pressure (Cp) is the amount of heat required to raise the temperature of 1 mol of the gas by 1 °C at the constant pressure.

The specific heat at constant pressure (Cp) is greater than that at constant volume (Cv). The relationship between Cv and Cp is given as :

Chemistry homework question answer, step 1, image 2

For monoatomic gas :

The degrees of freedom, f = 3 (3 translational motion only)

 

For diatomic gas :

The degrees of freedom, f = 5 (3 translational + 2 rotational)

 

For triatomic gas (linear molecule) :

The degrees of freedom, f = 5 (3 translational + 2 rotational)

 

For triatomic gas (non-linear molecule) :

The degrees of freedom, f = 6 (3 translational + 3 rotational)

Step 2

The given gases are

 

Ar :

This is a monoatomic gas.

Degree of freedom, f = 3

The theoretical value of Cv and Cp can be calculated as :

Chemistry homework question answer, step 2, image 1

Step 3

CO2 :

This is a linear triatomic gas.

Degree of freedom, f = 5

The theoretical value of Cv and Cp can be calculated as :

Chemistry homework question answer, step 3, image 1

...

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