Engineering Thermodynamics
Isochoric process is one in which

Very little mechanical work is done by the system
No mechanical work is done by the system
All parameters remain constant
Free expansion takes place

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

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

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