Please help! 2H2+ Oz--> 2H20 How many moles of oxygen are needed to react with 13 moles of hydrogen?

Question

I just don’t understand these topics and I need more background information so I can figure everything out..

Answer 1

you can use the coefficients on the balanced equation to set up a mole ratio between hydrogen and oxygen

2 H2 + O2 ---> 2 H2O means that the ratio is 1 mole O2 to 2 moles H2

13 moles H2 x (1 mole O2 / 2 moles H2) = 6.5 moles O2

meaning that 6.5 moles of oxygen are needed to react completely with 13 moles of hydrogen

Answer 2

Start with your balanced equation:

2 H₂ + O₂ → 2H₂O

The balanced equation shows the mole relationships between all the reactants and the products.

The question given is focusing on the relationship between oxygen and hydrogen.

From the balanced equation, the mole relationship between those two is:

2 mols H₂: 1 mole O₂

That means for every 2 mols of hydrogen that react, 1 mole of oxygen is needed. (half as much oxygen is needed)

The question gave us 13 moles of hydrogen so based on the balanced equation relationship, we can calculate the moles of oxygen needed.

13 mols H₂ x 1 mol O₂/2 mols H₂ = 6.5 mols O₂

Hope this helps!