[semistry]

I tried this problem:

How many grams of nitrogen monoxide can be produced when 9.0 grams of oxygen and 4.5 grams of ammonia are reacted together?  Besides nitrogen monoxide, water is the other product of the reaction.

I got 8.4 grams as an answer.  I don't know if that's correct.

9.0g O₂ + 4.5g NH₃ ====> NO + H₂O

hmm... can't get it to balance also

[lemonoman]

First, remember that oxygen exists as O₂ - this will change the stoichiometry of your reaction.

And also, it is important to ensure that both sides of the equation are 'balanced' - hydrogens are not balanced in your reaction, but have to be for the reaction to be acceptable.

Good luck!

[xiankai]

when balancing an equation, make sure u have all the reactants/products present on the each side of the equation, then balance by comparing elements/charges. dont include mass.

[Cotex]

   5  O2 + 4 NH3 ===> 4 NO + 6 H2O
 

you will get: 0,668 g of ammonia that dosent react whit your measurments if you react 9g O2 whith 4,5 g ammonia, 6.751625686 g Nitrogenmonoxide, and 6,078582697 g of water

 
i used this formel  m=n•M