How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 132.0 mL of 0.21 M H2SO4?

Answer 1

How many mols do you need? That is M H2SO4 x L H2SO4 = ?
Then mL x M = moles Substitute the dilute numbers and solve for the unknown.
You can use the dilution formula, also, if that is easier for you.
c1v1 = c2v2
c = concn
v = volume