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Oleum or fuming sulfuric acid refers to a solution of various compositions of sulfur trioxide (SO3) in sulfuric acid (H2SO4), which can also be described by the formula H2SO4.xSO3 where x is defined as the molar free sulfur trioxide content.

As being a mixture it does not have a chemical structural formula.

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The chemical formula for oleum is?

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To calculate the concentration of sulfur trioxide in oleum, you can use the formula below: Concentration of SO3 = (Oleum concentration x 2) / (3.14) This formula assumes that the oleum concentration is given as a percentage by weight. Simply plug in the value of the oleum concentration into the formula to find the concentration of sulfur trioxide.


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