Question

molar mass of ionic compounds
11
na
22.99
16
s
32.07
what is the molar mass of the ionic compound na2s?
na2s = ? $\frac{g}{mol}$

Explanation:

Step1: Identify the molar mass of each element

The molar mass of Na is 22.99 g/mol and of S is 32.07 g/mol.

Step2: Calculate the total molar mass of Na₂S

There are 2 Na atoms and 1 S atom in Na₂S. The molar - mass contribution of Na is 2×22.99 g/mol and of S is 32.07 g/mol. So, the molar mass of Na₂S is \(2\times22.99 + 32.07\) g/mol.
\[2\times22.99+32.07=45.98 + 32.07=78.05\] g/mol

Answer:

78.05