Calculate amount of total H2SO4 when 100 gm 109% labelled Oleum sample is completely destroyed by water ?.

SOLUTION: the amount H₂SO₄

Originally 109% 100 gm Oleum sample contains 40 gm free SO₃ and 60 gram H₂SO₄

Hence total Wt of H₂SO₄ =60 gm +49 gm =109 gm