So I did a titration at school the other day and one of the questions is asking us to calculate the molarity of a solution but I don't know the # of moles of the solute.

I know to calculate the molarity=# moles/ liters.

The mols = M x L = ?

You will have M of one of the substances and liters for both. At the end point of the titration mols of each substance is the same.