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The standard enthalpy of formation of hy...

The standard enthalpy of formation of hypothetical MgCl is `-125kJ mol^(-1)` and for `MgCl_(2)` is -642 kJ `mol^(-1)`. What is the enthalpy of the disproportionation of MgCl ?

A

`-492 kJ mol^(-1)`

B

`-392 kJ mol^(-1)`

C

`-767 kJ mol^(-1)`

D

`-517 kJ mol^(-1)`

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