Percent Composition by Mass - 3 | Chemical Calculations

Empirical formula is K_XCl_YO_Z ⇒ M_KxClyOz = X M_K + Y M_Cl + Z M_O = 39.1 X + 35.4 Y + 16.0 Z

%K = 39.1 X / M_KxClyOz = 0.319
%Cl = 35.4 Y / M_KxClyOz = 0.289
%O = 16.0 Z / M_KxClyOz = 0.392

If  X = 1, M_KxClyOz = 122.57 g.mol^-1 and Y = 1 and Z = 3.

X, Y and Z are the smallest whole number possible, so the empirical formula of this compound is KClO₃