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Answer 1

We know, the relation between molar specific heat capacity at constant volume and constant pressure , 
e.g., C_p-C_v=RCp​−Cv​=R 
where Cv is molar specific heat capacity at constant volume.
Cp is the molar specific heat capacity at constant pressure.

Given, Cv = 12.47 J/K/mol and we know, R = 8.31 J/K/mol 
so, Cp = Cv + R 
= 12.47 + 8.31 = 20.78 J/K/mol 

Hence , answer is 20.78 J/K/mol

Answer 2

Hola Mate !

Question:

The molar heat capacity at constant volume of argon gas , Ar , is 12.47 JKmol-1. What is the value of the molar heat capacity at constant pressure ?

Answer: Option A

Explanation:

The molar heat capacity at constant volume of argon gas , Ar , is 12.47 JKmol-1. The value of the molar heat capacity at constant pressure is 20.78 Jk-1 mol-1.

Hope It Helps !