Engineering Thermodynamics
According to First law of thermodynamics,

Internal energy, enthalpy and entropy during a process remain constant
Total internal energy of a system during a process remains 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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Engineering Thermodynamics
An open system is one in which

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

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