Mass of Solute Solution Concentration
Molar Mass of Solute
Volume of Solution
Use molar mass to calculate the number of moles in your solute.
(7.54g FeCl2) 1mol FeCl2 / 126.753g FeCl2
7.54 X 0.00788936
0.0594 mol FeCl2
Use the conversion factor (1L / 1,000 ml) to convert the volume of H2O from ml to L.
(85 ml Solution)(1L / 1,000 ml)
85 X 0.001
0.085 Liters Solution
Substitute known values into the equation for molarity and solve.
Molarity = Moles of Solute / Liters of Solution
Molarity = 0.0954 mol FeCl2 / 0.085 L Solution
0.698 mol FeCl2 / 1 L Solution