The reaction is first order in and under certain conditions has a rate constant of 0.00752 at 20.0 . A reaction vessel initially contains 150.0 of 30.0% H2O2 by mass solution (the density of the solution is 1.11 ). The gaseous oxygen is collected over water at 20.0 as it forms.
What volume of O2 will form in 66.4 seconds at a barometric pressure of 703.0 . (The vapor pressure of water at this temperature is 17.5 )