Extraction of Zn is based on the following thermodynamic reaction.
(A)` 2ZnS + 3O_(2) to 2ZnO+ 2SO_(2)`
(B) `ZnO + C to Zn + CO" " DeltaG_(f)^(0)` are given
`ZnS = - 2 xx 10^(2) kJ//"mol"`
`SO_(2) = -3 xx 10 ^(2) KJ//"mole"`
`CO_(2) = -2 xx 10 ^(2)KJ//"mole"`
`ZnO = -3 xx 10^(2) KJ//"mol"`
`DeltaG^(0)` for the reaction (A) is -` X xx 10^(5) J//"mol"` The value of X a will be

Answer

8