Question

A certain quantity of a compound contains 0.9 gm Al and 0.8 gO .what is the empirical formula of the compound

Answer 1

Al3O5

Explanation:

Al of 0.9g and O of 0.8g

Molar weight of aluminum = 27

Molar weight of oxygen = 16

Moles of Al = 0.9 / 27 = 9/ 270 = 1/ 30 = 0.03

Moles of O = 0.8 / 16 = 1/20 = 0.05

Ratio of the moles = 0.03 : 0.05 = 3:5

So the empirical formula would be Al3O5.