An aqueous solution of H₂O₂ is labeled as 33.6 vol. The amount of H₂O₂ present in 50ml of such an aqueous solution is

33.6 volume strength of H2O2 means,
 

= 1680ml of O2 liberated from 50ml of H2O2 solution.
 

2 x 34 gr of ${\mathrm{H}}_2{\mathrm{O}}_2$ solutions → 22.4lit = 22400 ml
??  → 1680ml