150.0ml of iron(iii)chloride solution is mixed with 180.0ml of the sodium hydroxide solution,1.65g yield of experimental iron(iii)hydroxide is obtained.find the theoretical yeild of the precipitate.

how you find that ?

That's done just like the problem with concns; the theoretical yield is the mols Fe(OH)3 x molar mass Fe(OH)3. Just follow the appropriate steps in that prolem.