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

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

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Engineering Thermodynamics
According to First law of thermodynamics,

Total internal energy of a system during a process remains constant
Internal energy, enthalpy and entropy during a process remain constant
Total energy of a system remains constant
Work-done by a system is equal to the heat transferred by the system

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