Use the formula: Molarity = moles of solute ÷ liters of solution
Find the number of moles of solute
Convert the solution volume to liters
Divide moles of solute by liters of solution
If needed, calculate moles from mass using: moles = mass ÷ molar mass
If needed, convert milliliters to liters by dividing by 1000
Check that the final unit is mol/L or M