# If 120 moles of sodium carbonate are mixed with calcium hydroxide, how many moles of sodium hydroxide are formed?

$\text{Ca(OH)"_2(aq) + "Na"_2"CO"_3(aq) rarr "CaCO"_3(s)darr+"2NaOH} \left(a q\right)$
You have not told us the quantity of ${\text{Ca(OH)}}_{2} \left(a q\right)$ you have. ${\text{Saturated Ca(OH)}}_{2} \left(a q\right)$, aka $\text{lime water}$, does not contain a lot of solute. Anyway, the given equation is stoichiometrically balanced. You have to tell us how much calcium hydroxide was used.