Molecular mass of K 3 Fe(CN) 6 = 329.27 g/mol. Step 4: Find the mass percent composition of each element. To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass.This number must then be multiplied by 100% to be expressed as a percent.Mass percent composition of K = mass contribution of K/molecular mass of K 3 Fe(CN) 6 x 100%.olecular mass of K 3 Fe(CN) 6 = 329.27 g/mol. Step 4: Find the mass percent composition of each element. To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass.
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