A system contains 1 mol of a monoatomic ideal gas. Now 1 mol of a diatomic nonreacting ideal gas is added into the system at constant volume and temperature. Due to addition of diatomic gas, choose the incorrect statement, regarding the new system.
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Initially, 1 mol monoatomic gas (CV = 3R/2, CP = 5R/2, γ = 5/3). After adding 1 mol diatomic gas (CV = 5R/2, CP = 7R/2, γ = 7/5) at constant T and V, the system has 2 mol total.
The average γ for the mixture is between 1.4 and 1.67, so it decreases. Enthalpy H = nCPT increases as total n and average CP increase. Pressure P = nRT/V doubles, so it increases. Internal energy U = nCVT; while T is constant, total n and average CV increase, so U increases, it does not remain constant.
Final Answer: Internal energy of the system remains constant.