Question 1
Consider the following reaction:
2Al(s) + 3Cl2(g) → 2AlCl3(s); ΔH = -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?
Question 2
Consider the following standard heats of formation:
P4O10(s) = -3110 kJ/mol
H2O(l) = -286 kJ/mol
H3PO4(s) = -1279 kJ/mol
Calculate the change in enthalpy for the following process:
P4O10(s) + 6H2O(l) → 4H3PO4(s)