Empirical Formula Practice Problems Fat makes up a major portion of all soaps. A sample of a substance is determined to be composed of 0.89 grams of potassium, 1.18 grams of chromium, and 1.27 grams of oxygen. Calculate the empirical formula of this substance. To find the experimental empirical formula of a compound, a student heats a coil of magnesium ribbon 35.00 cm long in a crucible.
Water is added to the ash left in the crucible and the crucible is reheated until dry.