So, I'm down to my last straw in trying to figure out how to do these problems. If you decide to help me I'd prefer that you don't give me the answer, instead actually instruct me on how to reach the answer. I hope someone can help me because I just don't know how to solve the problem and I've tried Google, my Chemistry notes and books, and a little instruction booklet on Chemistry itself. Amazingly, nothing helped. So please help me out. Like I said before, show me the steps to solve the problem, not the answer itself.
1) In the formation of carbon dioxide from carbon monoxide and oxygen, how many moles of carbon monoxide are needed to react completely with 7.0 moles of oxygen gas?
2 CO + O2 -> 2 CO2
2) How many grams of water can be prepared from 5moles of hydrogen at standard conditions?
2 H2 + O2 -> 2 H2O
3) Ammonia, NH3, is commercially prepared by the Haber process. How many moles of ammonia can be formed from 44.8 liters of nitrogen gas and an excess of hydrogen at standard conditions?
3 H2 + N2 -> 2 NH3
Remember, no answers, just steps on how to reach the answers if that's at all possible.