The oxygen lab uses most of what we have learned this year.
Remember a mass-volume stoichiometry problem can be solved with a 4 step factor label problem.
**22.4 L gas per mole is only true at STP and dry conditions
The third set of boxes comes from the balanced reaction. (Use the coefficients or the big number in front of the chemical)
This will be the V1 T1 and P1 for a combo gas law problem. V1 is your answer, T1 is 273K and P1 is 760 mm Hg (STP)
V2 is what we are solving for.
T2 will usually be room temperature.
P2 is usually room pressure minus the water vapor pressure at T2. Use the corrected P2 to make the water correction.
In our classroom in Carson City, the room barometer usually reads around 850 to 855 hPa. Unfortunately it's not in mm Hg.
= 642 mm Hg - water vapor pressure. (Usually 15 to 20 mm Hg depending on temp of water).