Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Greater of the partial pressures of all
Sum of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight
Average of the partial pressures of all

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Engineering Thermodynamics
First law of thermodynamics

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

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Engineering Thermodynamics
An open 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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