Question

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) →→ 2Al2O3 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.
Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide:

4Al (s) + 3O2 (g) 2Al2O3 (s)

The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

A)5.3
B)7.4
C)4.7
D)9.4
E)5.0

Answer 1

4 moles Al to 3 moles O2

molar masses ... Al - 27 g ... O2 - 32 g

moles Al ... 2.5 / 27 ... 0.093 ... dividing by 4 = .023
moles O2 ... 2.5 / 32 ... 0.078 ... dividing by 3 = .026

Al is the limiting reactant ... 0.069 moles of O2 are consumed ... 3 * .023
... 32 g * .069 = ? ... added to 2.5 g of Al

Answer 2

7.4