How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2?
Reaction: 4Al + 3O2 ? 2Al2O3
A) 8.90
B) 10.1
C) 1.1
D) 14.6
E) not enough information
Answer: B