If `2AI(s) +1(1)/(2) O_(2)(g) rarr AI_(2)O_(3)(s), DeltaH =- 1667.8 kJ` `H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.9 kJ` Calculate `DeltaH` for the reaction `AI_(2)O_(3)(s) rarr 2AI(s) +1(1)/(2)O_(2)(g)`

If `2AI(s) +1(1)/(2) O_(2)(g) rarr AI_(2)O_(3)(s), DeltaH =- 1667.8 kJ

1.	If `2AI(s) +1(1)/(2) O_(2)(g) rarr AI_(2)O_(3)(s), DeltaH =- 1667.8 kJ` `H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.9 kJ` Calculate `DeltaH` for the reaction `AI_(2)O_(3)(s) rarr 2AI(s) +1(1)/(2)O_(2)(g)`
Answer» To calculate `DeltaH` of the reaction. `AI_(2)O_(3)(s) rarr 2AI(s) +1(1)/(2)O_(2)(g), DeltaH = ?` `DeltaH = - DeltaH_(1)` `= (-166.78) = 166.78 kJ mol^(-1)`

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If `2AI(s) +1(1)/(2) O_(2)(g) rarr AI_(2)O_(3)(s), DeltaH =- 1667.8 kJ` `H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.9 kJ` Calculate `DeltaH` for the reaction `AI_(2)O_(3)(s) rarr 2AI(s) +1(1)/(2)O_(2)(g)`

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