Engineering Thermodynamics
According to Avogadro's Hypothesis

Product of the gas constant and the molecular weight of an ideal gas is constant
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

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When heat is being absorbed, temperature of hot source and working substance should be same
All of these
When beat is being rejected, temperature of cold source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered

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