you can express the concentration of the following by means of molarity.
since molarity is expressed in moles per liter (mol/L), you will have to identify your given. if you are given with moles in an mL of solution (example number 1) you will have to convert mL into liters (i'm assuming that you know how to convert measurements) and then perform the calculation by dividing the number of moles in volume of your solution (L).
if you are given with the mass of the solute, then you just have to convert it into moles in order to follow the equation mole of solute/Liter of solvent.
every problem will be an easy task as long as you stick and follow the units.
you can also express the concentration into mmol of solute/mL of solvent.
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