To find the empircal formula start by looking at the masses of each element.
1) 7.19G* 1 mol/ 30.97 = 2.32mol Phosphorus
92.81G * 1 mol/ 79.90 = 1.16 Bromine
2) Since none of them give exact whole numbers you need to didvide each by the smallest amount
2.32/1.16 = 2 mol Phosphorus
1.16/1.16= 1 mol Bromine
3) write your answer
BrP2
* the 2 shoud be denoted as a subscript
and I believe that this same answer is this. compunds chemicial formula
