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
Sum of the partial pressures of all
Average of the partial pressures of all
Greater of the partial pressures of all

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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Total internal energy of a system during a process remains constant
Internal energy, enthalpy and entropy during a process remain constant
Work-done by a system is equal to the heat transferred by the system

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