CHM 2045C Module Seven Sample Exam

Module Seven Part H: Standard Enthalpies of Formation 5 points

Calculate ∆ H for the reaction:

2 Al (s) + 1 Cr₂O₃ (s) à 1 Al₂O₃ (s) + 2 Cr (s)

∆H˚_f (Al₂O₃ (s) ) = -1676 kJ/mol ∆H˚_f (Cr₂O₃ (s) ) = - 1128 kJ/mol

Answer: -548 kJ