An adiabatic process is performed on 15 moles of an ideal gas (γ = 1.44). what is the heat capacity at constant pressure for the gas? let the ideal-gas constant r = 8.314 j/(mol • k).

25 j/(mol • k)

27 j/(mol • k)

31 j/(mol • k)

23 j/(mol • k)

29 j/(mol • k)

27 J/(mol • K)

Explanation:

γ = Cp / Cv

We're given γ and we need to find Cp (heat capacity at constant pressure) per mole.  First we need to find Cv (heat capacity at constant volume).  Cv is defined as:

Cv = Cp − nR

where n is the number of moles and R is the ideal gas constant.

So:

γ = Cp / (Cp − nR)

γ (Cp − nR) = Cp

γ Cp − γnR = Cp

(γ − 1) Cp = γnR

Cp / n = γR / (γ − 1)

Given γ = 1.44 and R = 8.314 J/mol/K:

Cp / n = (1.44) (8.314 J/mol/K) / (1.44 − 1)

Cp / n = 27 J/mol/K

b.

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