To solve, you find the correct mole ratio from the given equation. The questions asks for how many moles of H2O from 2.0 moles of NH3(ammonia), so the mole ration is going to be 6:4. 6 moles of H2O and 4 moles of NH3.
<u>Tip:</u> We multiply the given with what we want divided by what we want to get rid of.
In an alkaline solution, red litmus paper turns blue. When an alkaline compound dissolves in water, it produces hydroxide ions, which cause the solution to become alkaline.