Engineering Thermodynamics
The volumetric or molar specific heat at constant pressure is the product of

Molecular mass of the gas and the gas constant
Atomic mass of the gas and the gas constant
None of the listed here
Molecular mass of the gas and the specific heat at constant volume

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Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Greater of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight
Sum of the partial pressures of all
Average of the partial pressures of all

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