When aluminum metal is exposed to oxygen gas, a coating of aluminum oxide forms on the s...

When aluminum metal is exposed to oxygen gas, a coating of aluminum oxide forms on the surface of the aluminum. The balanced equation for the reaction of aluminum metal with oxygen gas is

Suppose a sheet of pure aluminum gains 0.0900 g of mass when exposed to air. Assume that this gain can be attributed to its reaction with oxygen.

(a) What mass of O₂ reacted with the Al?

(b) What mass of Al reacted?

(c) What mass of Al₂O₃ formed?