A sample of O2 gas was collected... Chemistry partial pressure problem?

O

okaygo

New member
A sample of O2 gas was collected over water at 20 degrees Celsius and at a total pressure of 786 mm Hg.
The total volume collected was 485mL.
The vapor pressure of pure water at 20 degrees C is 17.5 mm Hg.
What is the pressure of the O2 gas alone?

Please solve and show work =)
Thanks!
 
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