How to determine the average molecular weight of circulating hydrogen?
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For example: in the recycled gas, H2 accounts for 95%, CH4 for 3%, C2H6 for 1.97%, and H2S for 0.03%. Then the average molecular weight of the recycled gas = 2×0.95 + 16×0.03 + 44×0.0197 + 34×0.0003 = 3.257
The gas composition must be on a volume ratio or molar ratio basis; a weight ratio is not acceptable. The molecular weight of a gas mixture is the sum of the mole fractions of the molecular weights of its components, which conforms to the additivity rule for partial molar quantities. The same is true for density.
What if there is isobutane inside?