FREE POINTS HURRY PLEASE! help me - you do not have to explain your answer If you dont want to, I just want the 2 answers to these two multiple choice problems because I am struggling!

We must use 5 moles of

8.19 moles of oxygen are needed

Explanation:

The balanced chemical reaction is:

As is the limiting reagent as it limits the formation of product and is the excess reagent.

According to stoichiometry :

2 moles of require = 1 mole of

Thus 10 moles of will require=  of

 Thus we must use 5 moles of

The balanced chemical reaction is:

According to stoichiometry :

2 moles of require = 3 mole of

Thus 5.46 moles of will require=

8.19 moles of oxygen are needed