# Oleum!

Chemistry Level 4

0.5 grams of Oleum is diluted with $$\ce {H2O}$$ . The resultant solution required 26.7 ml of 0.4 N NaOH solution for complete neutralisation. Find the percentage of free $$\ce {SO3}$$ in the sample of Oleum and also find Label for oleum

Enter your answer as sum of the values (up to 2 decimal places).

Note: Label is actually the final weight of $$\ce {H2SO4}$$ after complete conversion of 100gm oleum mixture($$\ce {SO3}$$ & $$\ce {H2SO4}$$) to sulfuric acid after addition of water.

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