′′10 volume H2O2′′ means 1mL of its solution on decomposition at NTP, give 10mL oxygen gas. Volume of oxygen formed from 100mL of solution at NTP=1000mL 2H2O22moles2×34g2H2O+O21mole22400mL ∵22400mLO2 formed at NTP by decomposition of 68gH2O2. ∴1mLO2 formed at NTP from 2240068 of H2O2 ∴1000mLO2 formed at NTP from 2240068×1000gH2O2=3.035gH2O2
So, concentration of ′′10 volume H2O2’’ =3.0% approximately