Calculate the Enthalpy change for the following reaction where Δ Hf for Al₂O₃(g) is -1669.8 kJ/mole and -241.8 kJ/mole for H₂O.
Al₂O₃(s) + 3H₂ (g) → 2Al(s) + 3H₂0 (g)
a. 944 kJ
b. 1428 kJ
c. -1428 kJ
d. -944 kJ