Question

How many moles of Al atoms are needed to combine with 1.58 mol of O atoms to make aluminum oxide, Al2O3

Answer 1

Explanation:

First of all the formula of Aluminium oxide is Al2O3

Now the Balanced Chemical Equation

4Al + 3O2 ----> 2 Al2O3

3 moles of Oxygen require = 4 moles of Al

1 mole -------------------------- = 4/3

1.58 mole ---------------------- = 4/3 x 1.58 = 2.10666... = 2.107 (approx)

2.107 moles of Al are needed to combine with 1.58 moles of O2