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What volume of O2 will form in 51.7 seconds at a barometric pressure of 794.0 mmHg

The reaction 2H2O2(aq)->2H2O(l)+O2(g) is first order in H2O2 and under certain conditions has a rate constant of 0.00752 s^-1 at 20.0 degrees Celsius. A reactionvessel initially contains 150.0mL of 30.0% H2O2 by mass solution (the density of the solution is 1.11g/mL). The gaseous oxygen is collected over water at 20.0 degreesCelsius as it forms.

)The vapor pressure of water at this temperature is 17.5mmHg )
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