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

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Engineering Thermodynamics
First law of thermodynamics

All of these
Enables to determine change in internal energy of the system
Does not enable to determine change in entropy
Provides relationship between heat, work and internal energy

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