Why in the manufacture of H2 SO4 by cont...

Why in the manufacture of `H_2 SO_4` by contact process, sulphur trioxide is not directly dissolved in water ?

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`SO_(3)` reacts with water to form `H_(2)SO_(4)` which forms a mist that a diffcult to condense. It escapes in the atomsphere. It is, therefore, absorbed in conc. `H_(2)SO_(4)` to form oleum which may be diluted to form `H_(2)SO_(4)`

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