When magnesium metal is burned in air (Figure 3.6), two
products are produced. One is magnesium oxide, MgO. The
other is the product of the reaction of Mg with molecular
nitrogen, magnesium nitride. When water is added to magnesium
nitride, it reacts to form magnesium oxide and ammonia
gas. (c) In
an experiment, a piece of magnesium ribbon is burned in air
in a crucible. The mass of the mixture of MgO and magnesium
nitride after burning is 0.470 g. Water is added to the
crucible, further reaction occurs, and the crucible is heated to
dryness until the final product is 0.486 g of MgO. What was
the mass percentage of magnesium nitride in the mixture obtained
after the initial burning?
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