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 calculate the number of atoms of na in 4.00 moles 4.oo moles na 6.022 x10^23 ------------------- = 2.41x10^atoms of na 1 moles the unit on top should go on the unit on the bottom 5 terms that are the same and u give your answer in grams they will be the same numerically molecular mass formula mass formula mass molecular weight molar mass molar mass= the atomic mass,molecular mass of formula mass measured in grams formula mass ex- h2o h 2x1.01g= 2.o2 o 1x16.oo g 18.02 formula mass is the atomic masses of the atoms in the element times thier subscript so answer equals grams per mole of the element ex moles in 50.00 of glucose(c6h12o6) 50g of c6h12o60 ------------------------------ 180.18 gc6h12o6 end up dividing 50 by 180.18 = 0.27moles of c6h12o6 grams to moles use the molar mass = to formula mass finding percent of a part of an atom figure out molar mass part divided by molar mass x 100 ex 72.06 ----------- x100=39.00 180.10 when you get ratios cross mulitply and divide 39.99 8.95 _____=______ 100g 224g