Engineering Thermodynamics
A closed system is one in which

Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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Engineering Thermodynamics
According to Avogadro’s law

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

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