Engineering Thermodynamics
An isolated system is one in which

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

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

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

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