Acompound is used to treat iron deficiency in people. it contains 36.76% iron, 21.11% sulfur, and 42.13% oxygen. the empirical formula is

Greetings!To find the empirical formula you need the relative atomic mass of each element!

Fe = 55.8

S = 32.1

O = 16

You can simply change the percentages into full grams

Fe = 36.76

S = 21.11

O = 42.13

Then you use this to find the Number of moles = amount in grams / atomic mass

Fe = 36.76 ÷ 55.8 = 0.6587

S = 21.11 ÷ 31.2 = 0.6766

O = 42.13 ÷ 16 = 2.6331

Then divide each number of moles by the smallest value:

Fe = 0.6587 ÷ 0.6587 = 1

S = 0.6766 ÷ 0.6587 = 1.0271 ≈ 1

O = 2.6331 ÷ 0.6587 = 3.99 ≈ 4

So that means that there are 1 iron, 1 sulfur and 4 oxygen. This means the empirical formula would be:

FeSO₄

Hope this helps!