Question

6 How many moles are in a 321 g sample of magnesium?

Answer 1

Answer:

13.4mol of Mg

Explanation:

Given parameters:

Mass of magnesium = 321g

Unknown:

Number of moles  = ?

Solution:

The number of moles of a substance is given as;

  Number of moles  = $\frac{mass}{molar mass}$  

 Molar mass of Mg = 24g/mol

 Insert the parameters and solve;

        Number of moles  = $\frac{321}{24}$   = 13.4mol of Mg