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which is the correct formula for the combustion of S8 at STP, (a) or (b)?

a) S8(s) + 4O2(g) ==> 4SO2(g)
b) S8(s) + 8O2(g) ==> 8SO2(g)

someone told me it is (a), but that is not balanced... or is it right?

please and thank you!!!!

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