Engineering Thermodynamics
According to First law of thermodynamics,

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

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Engineering Thermodynamics
Extensive property of a system is one whose value

Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume
Is not dependent on the path followed but on the state
Is dependent on the path followed and not on the state

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