Divide the 40.0g by the density to get mL. Divide that by .98 to get effective volume
you can solve it using a proportion. heres the calc.
40g/? =98% / 2%
40x2% = 98% x ?
divide by 98%
(40x2%)/98% = ?
?= .89 g
add that to the 40g of sulfuric acid and you get 40.89g
then divide by the density to get the volume
40.89(g) / 1.84(g/cm3) = 22.2 cm3