Question

Calculate cP and cV for argon. Given R = 8.3 J mol–1 K–1.

Answer 1

we know, Argon, Ar is monoatomic gas.

so,degree of freedom, f = 3

we know, molar heat capacity at constant volume is given as, $C_v=\frac{f}{2}R$

= (3/2)R

given, R = 8.3 J/mol.K

Cv =(3/2) × 8.3 = 12.45 J/mol.K

we also know, $C_P-C_V=R$

so, molar heat capacity at constant pressure, $C_P=C_v+R$

= (3/2)R + R

= (5/2)R

= 5 × 8.3/2

= 20.75 J/mol.K