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All right today chemistry we're going to talk about how to calculate molar mass how many grams per 1 mole is in a substance so what we're going to do first using an example this is calcium phosphate so the first thing that we need to do to calculate molar mass is figure out which types of atoms we have in the compound and how many so for example if I look at calcium phosphate the subscript 3 tells me that there's three calcium atoms so for calcium that's going to be three calcium atoms times the molar mass of calcium if you refer to your parent table you'll find that each calcium always forty point zero eight grams, but we have that three times when we do this out we have three times forty point zero eight that's going to contribute 120 white to four grams into the compound okay next we have a phosphate ion their key or formal, but we have to keep in mind that we have two of those, so we have to distribute this 2 to the 4 into the 1 understand so phosphorus we have two phosphorus times its molar mass and the PRI table says that phosphorus is 31 grams okay, so that's going to be two times 31 and that's going to continue to 62 grams to the total mass of the compound then finally in the last atom here is oxygen and within the compound there are two times four is eight, so that's going to get us feed oxygen each one weighing in roughly around 16 grams okay which is going to be 128 grams okay just sort of backtrack here 120.24982 62 grams is from the phosphorus and make up the compound and finally 128 grams is from the oxygen so what we have to simply do here is add up these totals here 120 point 2 4 + 62 + 128 grams and that's going to get us in the ballpark of 310 point 2 4 grams, so we conclude at the end of this is that one mole of calcium phosphate is 310 point 2 and that's how you calculate moles
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