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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All the processes, taking place in the cycle of operation, must be extremely slow
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
The working parts of the engine must be friction free
All of these

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