Solving 3 Gas Mixture: Assumptions & PV=mRT

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The discussion centers on a rigid container filled with three gases, A, B, and C, and the pressure readings obtained when each gas is individually introduced. It highlights the assumption that the volume remains constant and that all gases behave ideally, which is crucial for applying the ideal gas law (PV=mRT). There is a query regarding the unit for measuring the "amount of gas" to facilitate comparisons among the different gases. The conversation emphasizes the importance of understanding gas behavior under varying conditions of pressure and temperature. Overall, the analysis seeks to clarify the assumptions necessary for accurate gas mixture evaluations.
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1. A rigid container is filled with a mixture of three gases: A, B and C. the pressure gauge reads P[T]. The container is evacuated and fill with an amount of gas A equal to that in the original mixture. The gauge now reads P[A]. This process is repeated for gases B and C with the pressure gauge reading P and P[C]? What assumptions are made?



2. PV=mRT



3. The gases are related by the volume because they might have different pressures, temperatures and mass.
 
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I don't see any assumptions made (apart from "the container is filled with gas 4 times"), as there is no analysis described.
I guess an analysis will assume that volume is constant, and it might be a reasonable assumption that all gases are ideal.

What is the unit for "amount of gas" to compare different gases?
 

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