Engineering Thermodynamics
According to Avogadro's Hypothesis

The sum of partial pressure of mixture of two gases is sum of the two
The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
Product of the gas constant and the molecular weight of an ideal gas is constant
Gases have two values of specific heat

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

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

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