An oleum sample is labelled as (100 + x)% and it contain 90 % free SO3 by weight. Hence, x
is
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Answer:
118% oleum means 100 g of oleum requires 18 g of H
2
O to form 118 g of H
2
SO
4
.
SO
3
+H
2
O→H
2
SO
4
1 mol 1 mol
(80 g) (18 g)
18 g H
2
O ≡80 g SO
3
∴ Percentage of free SO
3
=
18
18
×80=80%
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