# How do I calculate the grams of a product after a reaction?

If you mix $50\,\mathrm{mL}$ of $2.5\,\mathrm{M}$ $\ce{HCl}$ with $100\,\mathrm{mL}$ $2.5\,\mathrm{M}$ $\ce{NaOH}$, you will get sodium chloride. If such reaction occurs only at $50~\%$, how many grams of sodium chloride will you get?

Well, I guess that the reaction is like

$$\ce{HCl + NaOH \to NaCl + H2O}$$

Since the concentration is the same for both reagents ($2.5\,\mathrm{M}$), I imagine that the concentration will be the same for the products?

So we got $2.5\,\mathrm{M}$ of $\ce{NaCl}$. However, to get the grams I first need to know the moles of $\ce{NaCl}$. I know that the concentration is $2.5\,\mathrm{M}$, but what of it? What can I do to get the moles of the resulting $\ce{NaCl}$?

• Your idea about the concentration is a good start. Remember that you need moles in the end. How can you calculate moles? Which of the possibilities might be applicable here? And how would that prompt you to continue? ;) – Jan Oct 6 '15 at 21:36