Consider the following reaction: 2Al(s) + 3Cl₂(g) → 2AlCl₃(s); ∆H = –1390.81 kJ

a) Is the reaction exothermic or endothermic?
b) How much heat is produced/required when 10.0 g AlCl₃ forms.
c) How many grams of Al are required to absorb/evolve 1.00 kJ of energy?