For the molecular compound dinitrogen monoxide,?

Question

what would you multiply "molecules of N2O" by to get the units "grams of N2O" ?

Answer 1

you multiply by the molecular mass. Basically you have two atoms of nitrogen and one of oxygen. Look up the atomic mass for each and since you have two nitrogen you multiply its atomic mass by 2. Then you add together That gives you the molecular mass. Then multiply that by the number of molecules to get the whole mass.

Answer 2

If you mean individual molecules then use Avogadro's constant. - 6.022 x 10^23 this is the number of molecules in one mole.
1 mole(N2O) = mass/ 44 Mr
molar mass (N2O) = 44 grams
and the molar mass of 44 grams(N2O) contains 6.022 x 10^23 molecules of N2O.