If `{:(X(g)^(-) rarr X(g)^(2) +3e^(-),DeltaH_(1)= 900 kJ),(X(g) rarr X(g)^(2+),DeltaH_(2)=650kJ):}` Then find `DeltaH_(eg)` of X

If `{:(X(g)^(-) rarr X(g)^(2) +3e^(-),DeltaH_(1)= 900 kJ),(X(g) rarr X(g)^(2+),DeltaH_(2)=650kJ):}`
Then find `DeltaH_(eg)` of X.
A. `-250kJ`
B. `-1550kJ`
C. `250kJ`
D. `+1550kJ`

If `{:(X(g)^(-) rarr X(g)^(2) +3e^(-),DeltaH_(1)= 900 kJ),(X(g) rarr X(g)^(2+),DeltaH_(2)=650kJ):}` Then find `DeltaH_(eg)` of X.

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