Question

example 9 determine the molar mass of mg(no₃)₂.

Explanation:

Step1: Identify atomic masses

Atomic mass of Mg: \(24.305\) g/mol, N: \(14.007\) g/mol, O: \(16.00\) g/mol.

Step2: Calculate moles of each atom

In \(Mg(NO_3)_2\), 1 Mg, 2 N, \(2\times3 = 6\) O.

Step3: Calculate mass for each atom

Mass of Mg: \(1\times24.305 = 24.305\) g/mol.
Mass of N: \(2\times14.007 = 28.014\) g/mol.
Mass of O: \(6\times16.00 = 96.00\) g/mol.

Step4: Sum the masses

Molar mass = \(24.305 + 28.014 + 96.00\)
= \(148.319\) g/mol (rounded as needed).

Answer:

The molar mass of \(Mg(NO_3)_2\) is approximately \(148.32\) g/mol (or \(148.3\) g/mol depending on rounding).