Chemistry Lab-- Hydrogen Powered Rocket help???!?

Ok, 273 is standard.. I ume 101.3 kpa is also standard pressure. I am not familiar with that pressure i.d. I also ume you want the most energy from the oxygen and hydrogen mix. It could be molar and it may not! A rocket engine uses an off line.. meaning not strotchiometric sp? mix. It means it does not use as much oxygen as would be calculated.. But I did not see you ask this. The reaction to make the hydrogen does not matter as you are asked only about the hydrogen and the oxygen. Ok, you are apparently saying you are not separating the oxygen from the air.. You are using air for the oxidizer. I am unsure of the accuracy desired but air has about 23% O2. You need the the value accepted by your book! The following is based on if the pressure of 101.3 is considered standard pressure. You will never get the optimum O2 if you use air.. It will be the optimum air and not oxygen. You said the oxygen is from the air.., but is this separated so we have all oxygen? Science is suppose to be an absolute with facts.. Get back and add more info.. is this oxygen or just air? I could give both, but room says tell us which. Earl