Question

How many moles of magnesium chloride do you need to make one liter of 4M solution?

Answer 1

4 mol `MgCl_2`

Explanation:

By definition, 1 M=1 mol/L

Set up a proportion:
`4 M MgCl_2 = (x mol) /(1 L)`
x = 4 mol `MgCl_2`