Question

unit exam - ionic compounds and metals
7 n 14.01
12 mg 24.31
what is the molar mass of the ionic compound mg3n2?
mg3n2 = ? $\frac{g}{mol}$

Explanation:

Step1: Determine molar mass of Mg

The molar mass of Mg is 24.31 g/mol from the periodic - table, and there are 3 Mg atoms in Mg₃N₂.
$3\times24.31\ g/mol$

Step2: Determine molar mass of N

The molar mass of N is 14.01 g/mol from the periodic - table, and there are 2 N atoms in Mg₃N₂.
$2\times14.01\ g/mol$

Step3: Calculate molar mass of Mg₃N₂

Add the molar masses of Mg and N in Mg₃N₂.
$M = 3\times24.31\ g/mol+2\times14.01\ g/mol=72.93\ g/mol + 28.02\ g/mol=100.95\ g/mol$

Answer:

100.95