Essential Chemistry for IGCSE - The Chemical Industry (Section 4 - No. 35)
Which of the following reactions is used to produce sulfur trioxide (SO3) in the Contact Process?
S + O2 -> SO2
SO2 + O2 -> SO3
SO3 + H2O -> H2SO4
H2SO4 + SO3 -> H2S2O7
Explanation
Sulfur dioxide (SO2) reacts with oxygen to produce sulfur trioxide (SO3).
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