Answer to Question #154019 in General Chemistry for Kayla Davis

Question

Calculate the number of moles of aluminium atoms that will react with 3.18 mol of oxygen molecules to form aluminium oxide. The balanced equation is: 4 Al(s) +3 O2(g) → 2 Al2O3(s)

Answer 1

Solution:

A chemical equation must be balanced:

4 Al(s) +3 O₂(g) → 2 Al₂O₃(s)

x     –    3.18     

According to the reaction equation for 3 mol of O₂ are needed 4 moles of Al.

Therefore,

Moles of Al = 4 mol Al × 3.18 mol O₂ / 3 mol O₂ = 4.24 mol

Answer: for 3.18 moles of O₂ are needed 4.24 moles of Al.