For the reaction ?H2+?O2 →?H2O, what is the maximum amount of H2O which could be formed from 10.9 g of H2 and 16.03 g ofO2? Answer in units of g.

Answer 1

It seems as though I am doing all of your homework for you. So, in this problem, I'll get you started and hopefully you can complete the assignment.

Always start with the balanced equation:

2H₂ + O₂ ==> 2H₂O ... balanced equation

Anytime you are given amounts of BOTH reactants, you MUST find the limiting reactant:

10.9 g H2 x 1 mol H2/2 g H2 = 5.45 mol H2

16.03 g O2 x 1 mol O2/32 g O2 = 0.500 mol O2

Clearly, by looking at the balanced equation you can tell that O2 is limiting because it takes 2 mol H2 for each 1 mol O2, and there is plenty of H2 present (5.45 mol vs. 0.500 mol).

Now you can find maximum amount H2O formed:

0.500 mol O2 x 2 mol H2O / 1 mol O2 x 18 g H2O/mol H2O = answer in grams