Engineering Thermodynamics
Isochoric process is one in which

All parameters remain constant
Very little mechanical work is done by the system
No mechanical work is done by the system
Free expansion takes place

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Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Atomic mass of the gas and the gas constant
Molecular mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the specific heat at constant pressure

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Engineering Thermodynamics
According to Avogadro’s law

All of these
The product of the gas constant and the molecular mass of an ideal gas is constant
Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
The sum of partial pressure of the mixture of two gases is sum of the two

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