Engineering Thermodynamics
According to Avogadro's Hypothesis

Gases have two values of specific heat
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

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

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Engineering Thermodynamics
Gases have

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

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