Acompound is 2.00% h by mass, 32.7% s by mass, and 65.3% o by mass. what is its empirical formula? the second step is to calculate the number of moles of each element present in the sample. to do this, you must divide the mass of each element by its molar mass. the masses of the elements present are: mass h = g mass s = g mass o = g

Lets take 100 g of this compound,
so it is going to be 2.00 g H, 32.7 g S and 65.3 g O.

2.00 g H *1 mol H/1.01 g H ≈ 1.98 mol H
32.7 g S *1 mol S/ 32.1 g S ≈ 1.02 mol S
65.3 g O * 1 mol O/16.0 g O ≈ 4.08 mol O

1.98 mol H : 1.02 mol S : 4.08 mol O = 2 mol H : 1 mol S : 4 mol O

Empirical formula
H2SO4

1s2 2s2 2p1

Explanation: