43.64g P x (1 mol P / 30.974g P) = 1.409 mol
P
56.36 g O x (1 mol O / 15.999g O) = 3.523 mol
O
So since we chose 100.00 g
of compound we have 43.64g P & 56.36 g O.
2nd Step: Convert grams to moles.
Can we compare
grams directly?
A
white compound is analyzed and found to contain
43.64%
phosphorous and 56.36% oxygen by mass.
Empirical
Formula Example 1