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

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

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Engineering Thermodynamics
According to First law of thermodynamics,

Work-done by a system is equal to the heat transferred by the system
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

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle

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