Engineering Thermodynamics
The volumetric or molar specific heat at constant pressure is the product of

Molecular mass of the gas and the gas constant
Atomic mass of the gas and the gas constant
None of the listed here
Molecular mass of the gas and the specific heat at constant volume

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Engineering Thermodynamics
A closed system is one in which

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

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