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Sulfur trioxide, SO3, is made from the oxidation of SO2, and the reaction is represented by...

Sulfur trioxide, SO3, is made from the oxidation of SO2, and the reaction is represented by the equation: 2SO2 + O2 ® 2SO3 A 21-g sample of SO2 gives 18 g of SO3. The percent yield of SO3 is

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