Engineering Thermodynamics
According to Avogadro's Hypothesis

The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
The sum of partial pressure of mixture of two gases is sum of the two
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
The specific heat at constant volume is

Any one of the above
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
The amount of heat required to raise the temperature of 1 kg of water through one degree

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