Question

The balanced chemical reaction for producing water is: 2 H2 + 1 O2  2 H2O. Predict which reactant amounts would get the most water with the least amount of leftovers.

Answer 1

As per the balanced equation we know that we need more amount of hydrogen and half amount of oxygen for production of water

2H2 + O2 --> 2H2O

Let we have following cases

1) 5 molecules of H2 and 3 molecules of O2

Then we will obtain 5 molecules of water and 0.5 moleculess of O2 left over

2) 5 molecules of H2 and 5 molecules of O2

Then we will again got 5 molecules of water and with 2.5 molecules of O2 as left over

3) 3 molecules of H2 and 5 molecules of O2

Then we will get only 3 molecules of water and with left over 3.5 molecules of O2.

Hope it will help you.