Question

100.00g of MgCl2 is weighed out for an experiment; how many moles does this comprise?

Answer 1

Answer:

1.05mol

Explanation:

Given parameters:

Mass of MgCl₂  = 100g

Unknown:

Number of moles  = ?

Solution:

The number of moles in a compound can be derived using the expression below:

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

Molar mass of MgCl₂   = 24 + 2(35.5) = 95g/mol

  So',

    Number of moles  = $\frac{100}{95}$   = 1.05mol