Question

If you had excess chlorine, how many moles of of aluminum chloride could be produced from 20.0 g of aluminum?

If you had excess aluminum, how many moles of aluminum chloride could be produced from 25.0 g of chlorine gas Cl2?

Answer 1

Here is a worked example that will take care of all of your stoichiometry problems. Just follow the steps. Post your work if you get stuck.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

6557 mmHg