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2Zn + O(2) rightarrow 2ZnO, Delta G^(@) ...

`2Zn + O_(2) rightarrow 2ZnO, Delta G^(@) = -616 J`
`2Zn + S_(2) rightarrow 2ZnS, Delta G^(@) = -293 J`
` S_(2) + 2O_(2) rightarrow 2SO_(2), Delta G^(@) = -408 J`
`Delta G^(@)` for the following reaction
`2ZnS + 3O_(2) rightarrow 2ZnO+ 2 SO_(2) ` is

A

`-713J`

B

`-1317J`

C

`-501J`

D

`+731J`

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The correct Answer is:
A
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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:

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The factor of DeltaG values is important in metallurgy. The DeltaG values for the following reactions at 800°C are given as : S_(2)(s) + 2O_(2)(g) to 2SO_(2)(g), DeltaG =-544 kJ 2Zn(s) + S_(2)(s) to 2ZnS(s), DeltaG=-293 kJ 2Zn(s) + O_(2)(g) to 2ZnO(s), DeltaG = -480 kJ Calculate the DeltaG for the reaction: 2ZnS(s) + 3O_(2)(g) to 2ZnO(s) + 2SO_(2)(g)

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