The "thermite reaction' involving the reaction between ferric oxide and metallic aluminium produces molten iron. Given that \[2A1+3/2{{O}_{2}}\to A{{l}_{2}}{{O}_{3}};\Delta {{H}_{1}}=-400\,kcal/mol\] \[2Fe+3/2{{O}_{2}}\to F{{e}_{2}}{{O}_{3}};\Delta {{H}_{2}}=-200\,kcal/mol.\] What is \[\Delta H\] for the formation of 1 mole of iron?

• A. \[-100kcal\]
• B. \[-200\text{ }kcal\]
• C. \[+100\text{ }kcal\]
• D. \[+200\text{ }kcal\]