How you convert grams to moles is by dividing the amount of grams of the substance by the total mass in grams of the compound. For example, let's say I have 50g of HO and I want to know how many moles of HO I have. I would take 50g/17g per mole, which equals 2.941.
Thus, I have approximately 2.9 moles of HO. Seventeen is a rough estimate of how much HO weighs, which is found by adding the mass of Hydrogen and the mass of Oxygen. You can find more information here: chemteam.info/Mole/Grams-to-Moles.html.
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