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Using the following thermochemical data, calculate Δ H f° of Cr 2O 3( s). 2CrCl 3( s) + 3H 2O( l) → Cr 2O 3( s) + 6HCl( g) H° = 276.9 kJ/mol 2Cr( s) + 3Cl 2( g) → 2CrCl 3( s) H° = –1113.0 kJ/mol 4HCl( g) + O 2( g) → 2Cl 2( g) + 2H 2O( l) H° = –202.4 kJ/mol A. 633.7 kJ/mol B. –1187.5 kJ/mol C. –1038.5 kJ/mol D. –1139.7 kJ/mol E. 1592.3 kJ/mol