
Concept explainers
Interpretation: The empirical formula of the two Mg compounds must be found out.
Concept Introduction :
Empirical formula of a molecule is the smallest unit which is repeated in the molecule.
Molecular formula of a compound is the representation of the molecule with the number of different atoms present in the molecule.
Molecular formula

Answer to Problem 57A
The empirical formulae of the two Mg compounds are Mg3N2 and MgO.
Explanation of Solution
For the first compound mass of Mg is 0.9240 g and mass of N is
Moles of Mg
Moles of N
Smallest mole ratio Mg: N
Thus the empirical formula of the compound is Mg3N2.
For the second compound % of Mg and O are 60.31 and 39.69 respectively.
Moles of Mg
Moles of O
Smallest mole ratio Mg: O
Thus the empirical formula of the compound is MgO.
Empirical formulae of the two magnesium compounds are Mg3N2 and MgO.
Chapter 6 Solutions
World of Chemistry, 3rd edition
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