The reaction 2 H2O2(aq) ➝ 2 H2O(l) + O2(g) is first order in H2O2 and under certain conditions has a rate constant of k = 0.00752 s-1 at 20.0ºC. A reaction vessel initially contains 150.0 mL of 30.0 % H2O2 by mass solution. The density of the solution is 1.11 g/mL. The gaseous oxygen is collected over water at 20.0ºC as it forms. What volume of O2 forms in 85.0 seconds at a barometric pressure of 742.5 mmHg? The vapor pressure of water at this temperature is 17.5 mmHg.

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