The reaction 2 H₂O₂(aq) → 2 H₂O(l) + O₂( g) is first order in H₂O₂ and under certain conditions has a rate constant of 0.00752 s^-1 at 20.0 °C. 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 20.0 °C as it forms. What volume of O2 forms in 85.0 seconds at a barometric pressure of 742.5 mmHg?