Why can you only add oleum to water to get SO2(g) industrially instead of adding SO3(g) to H2O(l) immediately?

1 Answer
Andrea B.
Nov 28, 2017

see below

Explanation:

the reaction between #SO_3 and H_2O# is too esotermic to make it happen immediately (34,4 Kcal /mol) while if #SO_3 # (attention, not # SO_2#) is add to oleum, the reaction is much less esotermic because water is missing. Water is add later to oleum to disperd the heat in a most wide masss

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