Concentrated hydrogen peroxide solutions are explosivelydecomposed by traces of

Question

Concentrated hydrogen peroxide solutions are explosivelydecomposed by traces of transition metal ions 2H2O2(aq) -> 2H2O(l)+O2 what volume of pure O2 collected at 27 C and 764 torr would begenerated by decomposition of 125 grams of a 50% by mass hydrogenperoxide solution? Ignore any water vapor that may bepresent. Concentrated hydrogen peroxide solutions are explosivelydecomposed by traces of transition metal ions 2H2O2(aq) -> 2H2O(l)+O2 what volume of pure O2 collected at 27 C and 764 torr would begenerated by decomposition of 125 grams of a 50% by mass hydrogenperoxide solution? Ignore any water vapor that may bepresent.

Explanation / Answer

In a 50% solution of 125 g, the mass of H2O2 is 125 * 50/100 =62.5g MM (H2O2) = 34g/mol n (H2O2) = m/MM = 62.5/34 = 1.838mol moles of oxygen produced = 1.838/2 [because of stoichiomestry]= 0.919mol = n(O2) P = 764 torr = 101 858 Pa V = ? T = 27C = 27+273 K = 300K R = 8.314 J/K/mol PV = nRT V = nRT/P = 0.919 * 8.314 * 300 / 101858 = 0.0225m3 = 22.5 L of oxygen gas

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