Engineering Thermodynamics
Gases have

Two values of specific heat
No value of specific heat
Under some conditions one value and sometimes two values of specific heat
Only one value of specific heat

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

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