Empirical Formula of Magnesium Oxide Name________ You will need the following apparatus: Bunsen burner Tripod Clay pipe triangle Crucible and lid Balance Magnesium Tongs Crucible + Lid Instructions Set up the apparatus as shown Weigh the empty crucible and its lid Put in a piece of magnesium and weigh it again Heat the crucible with the bunsen – lift the lid occasionally to let in more oxygen When the reaction is complete, allow to cool, then weigh the crucible again You can now calculate the mass of the Magnesium, Oxygen and Magnesium Oxide You can now work out the empirical formula of the Magnesium Oxide Results table Calculate Empirical Formula Item Mass (1) Crucible + Lid (2) Crucible + Lid + Magnesium before heating (3) Crucible + Lid + Magnesium after heating Elements Magnesium Oxygen Amount in question Atomic mass (periodic table) 24 16 Number of moles = Amount in question . Atomic mass   __ = Mole ratio (divide each number of moles by the smallest number of moles) ______ Empirical formula Mg O Mass of Magnesium = (2) – (1) _______ Mass of Oxygen = (3) – (2) __________