Calculate the heta of formation of anhydrous `AI_(2)CI_(6)` from the following data:

Options

A. `2AI(s) +6HCI(aq) rarr AI_(2)CI_(6)(aq) +3H_(2)+1004.2 kJ`
B. `H_(2)(g) +CI_(2)(g) rarr 2HCI(g) +184.1 kJ`
C. `HCI(g) +aq rarr HCI (aq) +73.2 kJ`
D. `AI_(2)CI_(6)(s) +aq rarr AI_(2)CI_(6)(aq) +643.1 kJ`

Explanation

To calculate `DeltaH` of the following reaction:
`2AI(s) +3CI_(2)(g) rarr AI_(2)CI_(6)(s)`
`DeltaH = DeltaH_(1) +3DeltaH_(2) +6DeltaH_(3) - 4DeltaH_(4)`
`=- 1004.2 +3 (-184.1) +6 (-73.2) -(-643.1)`
`=- 1004.2 - 552.3 - 439.2 + 643.1`
`=- 1995.57 +643.1`
`=- 1352.6 kJ mol^(-1)`