In an experiment to determine the empirical formula of magnesium oxide, a student weighs an empty crucible then adds a strip of magnesium metal and reweighs the crucible. The crucible and magnesium are heated with a burner flame, which ignites the magnesium and forms a grey-white solid. After cooling, the crucible and solid are reweighed and the data are analyzed to give an empirical formula of ${Mg}_{5} O_{4}$ . Which could account for the observed ${Mg}_{5} O_{4}$ result rather than the expected $MgO$ ?

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Some of the magnesium reacts With atmospheric nitrogen to produce magnesium nitride.

A mixture of magnesium oxide and magnesium peroxide forms during combustion.

The piece of magnesium ribbon is shorter than recommended in the procedure.

The crucible and magnesium are heated longer than recommended in the procedure.

answer is A.

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Detailed Solution

Some of the magnesium reacts with atmospheric nitrogen to produce magnesium nitride because this inorganic substance is made up of several magnesium and nitrogen atoms. It appears as the mineral nitro magnesite in nature.

The end product of this reaction is Magnesium Nitride. As two reactants react to generate a single product, the aforementioned reaction can be both a synthesis and a combination.

Hence the correct option is A

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