Engineering Thermodynamics
An isolated system is one in which

Mass does not cross boundaries of the system, though energy may do so
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

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Engineering Thermodynamics
First law of thermodynamics

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

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