00:01
This question wants us to determine the empirical formulas and molecular formulas or molecular masses in order to fill this table.
00:11
So for this first compound, we know that the molecular mass is equal to 150, and we know how that is calculated.
00:20
They take the sum weights of all of the atoms, which make up the compound.
00:24
So we can use that in order to find the molecular formula.
00:29
And you know from the empirical formula that for every molecule there will be two carbons, three hydrogens, and three oxygens, and the molecular formula will be a multiple of this.
00:48
So it will be 2 times 12n, which is the weight of carbon, plus 3 times 1 times n, which is the weight of hydrogen, plus 3 times 16n, which is the weight of oxygen.
01:09
And we'll find that 150 is equal to 75n, and n equals 2...