I think you mean mole ratio. It is usually represented as the coefficient or big number in a balanced chemical equation.
N2 + 3H2 --> 2NH3
so the mole ratio of nitrogen to hydrogen is 1 : 3 or 1/3 and what you compare should be product / product or reactant / reactant
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percentage
Yes. A rational number is one that can be expressed as a ration of two whole numbers. 0.171717 is 171717/1000000 or the ration of 171717 to 1000000 [ the word rational has the same linguistic root as ratio].
For Ideal gases, mole fraction=volume fraction
british slang for a ration, from wartime food shortages
xx mmol x 1 mole/1000 mmol x 58.5 g/mole