How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?

Answer 1

moles NaOH = grams/molar mass
moles NaOH = moles HCl (1:1 in the reaction but write the equation to verify.)
M = mols/L. You have M and molesk solve for L, then convert to mL.