A compound is found to consist of 63% manganese and 37% oxygen by mass. What is the empirical formula?
% per 100wt => gms per 100 wt => moles => mole ratio => normalize (divide by smaller mole value) => adjust fraction* => Empirical Ratio => Empirical Formula
%Mn = 63% => 63gms = 63g/(55g/mole) = 1.15 mole Mn
%Oxy = 37% => 37gms = 37g/(16g/mole) = 2.31 mole Oxy
=> Empirical Formula =>
* If normalized ratio is in fractions of 0.25 or 0.75 adjust by multiplying by 4, or if fraction is 0.50, multiply by 2 => smallest whole number ratio => Empirical Ratio => Empirical Formula.