Question

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

F 13.2 mol Mg
G 13.4 mol Mg
H 13.6 mol Mg
J 13.8 mol Mg

Answer 1

13.4mol of Mg

Step-by-step 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 =
`(mass)/(molar mass)`

Molar mass of Mg = 24g/mol

Insert the parameters and solve;

Number of moles =
`(321)/(24)` = 13.4mol of Mg