(2)H2O2(aq) → (2)H2O(l) + O2(g)?

May 2021 3 111 Report

(2)H2O2(aq) → (2)H2O(l) + O2(g)?

Calculate the number of moles of oxygen gas produced from the completely catalyzed decomposition of 7.00ml sample of a 3.5% solution of H2O2. The density of the 3.5% solution of H2O2 is 1.01 g/ml.

Science & Mathematics / Chemistry

Dr.A

Verified answer

mass solution = 7.00 mL x 1.01 g/mL = 7.07 g

mass H2O2 =3.5 x 7.07 / 100 = 0.274 g

moles H2O2 = 0.274 g / 34.0148 g/mol = 0.00806

the ratio between H2O2 and O2 is 2 : 1

moles O2 = 0.00806 x 1 / 2 =0.00403

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Catalyst: simplest manganese(IV) oxide [used in nearly all schools and college experiments for this] even light will do .. this is why H2O2 is kept in dark bottles!