Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Sum of heat and work transfer will be zero
Its entropy will change due to irreversibility
Process is thermodynamically in equilibrium
Process is executed in closed system cycle

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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 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

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