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2SO2 + O2 → 2SO3; SO2 + H2O → H2SO3; H2SO3 + 1/2O2 → H2SO4. How much heat is released in these reactions? Does anyone knowledgeable know the answer? I don’t have any physics or chemistry manuals here, so I can’t figure it out. Please, experts, help me find out~~~~
Looking up in a chemical engineering handbook: the standard molar enthalpy of formation is –296.830 kJ/mol for SO2, and –395.72 kJ/mol for SO3. Therefore, for the reaction SO2(g) + O2(g) = SO3(g) + Q, we have Q = (–395.72 kJ/mol) – (–296.830 kJ/mol) = –98.89 KJ/mol. This means that 98.89 KJ/mol of heat is released. The standard molar enthalpies of formation for H2SO3 and H2SO4 could not be found; therefore, the exothermicity is unknown.
There are many such books on the forum; you should be able to find them if you search, though it will cost some money
Just search for it; you should be able to find it! !
I tried for half a day just now, but it didn’t get sent – it’s so frustrating! :Data for sulfuric acid can be found, but sulfurous acid is unstable and does not have a stable state; its properties can only be inferred from its electrochemical potential relative to sulfur. Based on this, it can be calculated that the heat released in the reaction SO2 + H2O → H2SO3 represents almost the entire reaction enthalpy, while the reaction H2SO3 + 1/2 O2 → H2SO4 involves almost no heat release. In practical applications, the dilution heat of solution for sulfuric acid also needs to be considered.
It can be simulated using Aspen.