Aluminum produced by the reaction of alumina with carbon forming aluminum and carbon dioxide according to
2 Al2O3 (s) + 3 C (s) → 4 Al (l) + 3 CO2 (g)
a. How many moles of aluminum are formed when 6 moles of carbon react?
b. When 9 moles of aluminum are produced, how many moles of carbon dioxide are also produced?