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Convert Parts per Million to Moles How do I convert a parts per million measurement of Hydrogen Sulfide content in Sulfur into moles? Answer: You need some additional information about the substances you are trying to convert. In the future, we hope to provide a calculator for this that will make the calculation easy! Explanation: You need to know the molar mass of Hydrogen Sulfide and the molar mass of Sulfur, and the mass of the sample you are trying to convert (or their molar volume and the volume of the solution instead of their molar mass and mass of the solution). Let's say that you have 100 parts of Hydrogen Sulfide per million parts of solution, and assuming that the molar mass of Hydrogen Sulfide is 3 kilograms per mole and the molar mass of Sulfur is 4 kilograms per mole (these are not the actual values), and assume that you have 5 kilograms of the mixed substance. You need to solve 

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