Luminum and oxygen react according to the following equation: 4al(s) +3o2(g) --> 2al2o3(s) what mass of al2o3, in grams, can be made by reacting 4.6 g al with excess oxygen?

8.7 grams

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.  

To calculate the moles, we use the equation:

As oxygen is in excess, Aluminium is the limiting reagent and limits the formation of products.

According to stoichiometry:

4 moles of aluminium give = 2 moles of

Thus 0.17 moles of aluminium give=

Mass of

Thus the mass of  is 8.7 grams

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i'm pretty sure it is letter c.) car