Calculate the mass (in g) of 9.85 x 10^19 CCl2F2 molecules in scientific notation

Hi so first you want to convert the molecules to moles and then from moles to grams. When going from molecules to moles you divide by 6.02 x 1023

So take (9.85 x 10^19) / (6.02 x 10^23) = 0.000163621 moles

Looking at a periodic table we can find the grams per mole of CCl2F2:

12g/mol x 1(C) + 35.453g/mol x 2(Cl) + 18.998g/mol x 2(F) = 120.902 g/mol

multiply by the number of moles so moles cancels and you have the mass in grams.

120.902 g/mol x 0.000163621 mol = 0.019782106142 grams

1.98 x 10^2 g

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