First slide

Hydrogen Peroxide

Question

6.8 gm of H₂O₂ is present in 500 ml of an aqueous solution. When 10ml of this solution is decomposed, what is the S.T.P. volume of oxygen obtained

Moderate

A

560 ml
B

11.2 lit.
C

44.8 ml
D

22.4 ml

Solution

$\large \begin{array}{l} M\; = \;\frac{{Wt}}{{MWt}}\; \times \;\frac{{1000}}{{V(in\;ml)}}\\ \;\;\;\;\;\; = \;\frac{{6.8}}{{34}}\; \times \;\frac{{1000}}{{500}} \end{array}$
M = 0.4M
volume strength = M x 11.2
= 0.4 x 11.2
= 4.48
4.48 volume strength of H₂O₂means
1ml of H₂O₂solution gives → 4.48ml of,O₂
10ml of H₂O₂ solution gives → ??ml of O₂
$\large \frac{10\times 4.48}{1}=44.8ml$
Therefore 10ml, 4.48(W/V%) volume strength of H₂O₂ solution gives 44.8ml of O₂ at STP.

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