Question

A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen. What is the most likely empirical formula of this compound?

Answer 1

A chromium oxide compound contains 104.0 grams of chromium and 48.0gram of oxygen, right ?

you know as well,

atomic mass of chromium, Cr = 52g/mol

atomic mass of oxygen , O = 16 g/mol

we know, number of mole of atom = given weight/atomic weight

number of mole of chromium in compound = 104/52 = 2 mol

number of mole of Oxygen in compound = 48/16 = 3

means, 2 mole of chromium and 3 mole of Oxygen forms chromium oxides

so, empirical formula of this compound must be $Cr_2O_3$