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molar mass = mass of 1mol of a substance
---> 1mol = 6.02 x 10^23 particles (avagardo's #)
*g/mol
molar mass of elements comes from the P.T.E.
Ex: molar mass of Na is 22.99 g/mol
MOLAR MASS OF COMPOUNDS:
take individual molar masses for each element and add together
Ex 1.) Strontium chloride (SrCl2)
1mol Sr + 2mol Cl
Molar mass of SrCl2 = (1)(87.62)+(2)(35.453) *DO NOT ROUND DECIMALS
SrCl2 = 158.526 g/mol
Ex 2.) H2O, (2)(1.0079) + (1)(15.999) = 18.0148 g/mol
CALCULATIONS INVOLVING MOLAR MASS:
moles to grams: 1.25 mol SrCl2 is how many grams?
1.25 mol SrCl2 x 158.526g/1mol *CONSIDER SIG FIGS!!!! round answer to 3 sig figs
=198 grams
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