examples
(mass to molecules)
•how many molecules of Teflon (C2F4) are in a 135-g sample? (hint: do you expect a little or gigantic answer?)
•think! g --> mol --> molecules
•you’ll need molar mass
C2F4 = 100.02 g/mol
135 g C2F4
100.02 g C2F4
1 mol C2F4
=
135 mol C2F4
135 mol C2F4
1 mol C2F4
6.022 x 1023 atoms
=
8.13 x 1023 C2F4 atoms