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Find the % labelling of 100 gm oleum sam...

Find the % labelling of 100 gm oleum sample if it contains 20 gm `SO_(3)`

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% labelling of oleum sample `= (100 + x)%`
`{:(SO_(3) " + " H_(2)O" "rarr,H_(2)SO_(4)),(20gm,),(1//4 " mole " 1//4 " mole ",),(" "4.5 gm,):}`
`:.` % labelling of oleum sample `= (100 + 4.5) % = 104.5%`
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