Engineering Thermodynamics
According to Avogadro's Hypothesis

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

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Engineering Thermodynamics
Gases have

Two values of specific heat
Under some conditions one value and sometimes two values of specific heat
No value of specific heat
Only one value of specific heat

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