From the given data, at STP, it was said “20 volumes of hydrogen peroxide” were involved which also means “20 volumes of O2”
Balanced equation will appear as
2 H2O2 (aq) → O2 (g) + H2 (l)
Therefore 1 L of hydrogen peroxide gives 20 L of O2 or (20 L O2 per 1 L solution)
Dilute aqueous hydrogen peroxide is used as a bleaching agent and for disinfecting surfaces and small cuts. Its concentration is sometimes given as a certain number of “volumes hydrogen peroxide,” which refers to the number of volumes of O2 gas, measured at STP, that a given volume of hydrogen peroxide solution will release when it decomposes to O2 and liquid H2O. How many grams of hydrogen peroxide are in 0.100 L of “20 volumes hydrogen peroxide” solution?
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.