The approximate mass of ${\mathrm{H}}_2{\mathrm{O}}_2$ present in 200mL of 100 volume ${\mathrm{H}}_2{\mathrm{O}}_2$ in grams is

2H₂O₂ $\to$2H₂O +O₂

2$\times$34 gms of H₂O₂ solution ------------22.4lit

?                                                   --------------- 20 lit

$\frac{20\times 2\times 34}{22.4} =60.71 \mathrm{gms} (\mathrm{w}/\mathrm{v})$