How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?

Answer 1

mols KOH = grams/molar mass
mols HCl = mols KOH (look at the coefficients in the balanced equation).
M HCl = mol HCl/L HCl. Solve for L HCl and convert to mL.