Engineering Thermodynamics
A closed system is one in which

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

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Engineering Thermodynamics
An isolated system is one in which

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

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Engineering Thermodynamics
First law of thermodynamics

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

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