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A mixture is prepared by mixing of 20 gm SO3 in 30 gm of H2SO4 . (I) Find the mole fraction of SO3 . (II) Determine % labelling of Oleum sample

SOLUTION:
 (i)    Total wt of Oleum is 20 gm SO3+ 30 gm H2SO4
(ii)
Given Wt of (Free) SO3= 40 % Find % labelling (X)
  % labelling(X) = 109%

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