`2Zn+O_(2)to2ZnO," "DeltaG^(@)=-606J` . . . (i) `2Zn+2Sto2ZnS," "DeltaG^(@)=-293J` . . .(ii) `2S+2O_(2)to2SO_(2)(g)," "DeltaG^(@)=-408J` . . . (iii) `

Monjur Alahi

`2Zn+O_(2)to2ZnO," "DeltaG^(@)=-606J` . . . (i)
`2Zn+2Sto2ZnS," "DeltaG^(@)=-293J` . . .(ii)
`2S+2O_(2)to2SO_(2)(g)," "DeltaG^(@)=-408J` . . . (iii)
`DeltaG^(@)` for the following reaction
`2ZnS+3O_(2)to2ZnO+2SO_(2)`
would be:
A. `-731J`
B. `-1317J`
C. `+731J`
D. `+1317J`


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Salim Ahmed Kawsar

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Correct Answer - A
`DeltaG^(@)=2DeltaG_(ZnO)^(@)+2DeltaG_(SO_(2))^(@)-2DeltaG_(ZnS)^(@)`
`=[-616-408]-[-293]`
`=-1024+293`
`=-731J`

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