Question

Calculate the [H3O+] when 1.65 grams of KOH are dissolved in 500.0 mL of solution

Answer 1

moles KOH = grams/molar mass.
solve for moles.
(KOH) = moles/L
solve for (KOH) = ?? molar.

That will be the OH^-.
(H^+)(OH^-) = 1 x 10^-14
solve for (H^+).