InterviewSolution
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InterviewSolution
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On the basic of the following `Delta_(r)G^(Theta)` values at `1073K`: `S_(1)(s) +2O_(2)(g) rarr 2SO_(2)(g) Delta_(r)G^(Theta) =- 544 kJ mol^(-1)` `2Zn(s) +O_(2)(g) rarr 2ZnO(s) Delta_(r)G^(Theta) =- 480 kJ mol^(-1)` `2Zn(s) +S_(2)(s) rarr 2ZnS(s) Delta_(r)G^(Theta) =- 293 KJ mol^(-1)` Show that roasting of zinc sulphide to zinc oxide is a spontaneous process.A. `-357 KJ`B. `-731 KJ`C. `-773 KJ`D. `-229 KJ` |
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Answer» Correct Answer - B `DeltaG` of formation of different substance are as `2SO_(2) =-544 KJ` `2 ZnS=-293 KJ` `2ZnO=-480 KJ` For the reaction, `2ZnS+ 3O_(2)(g) to 2ZnO(s) + 2SO_(2)(g)` `DeltaG=[(DeltaG_("(products)")-DeltaG_("(reactants)")]` `[(-480) + (-544)-(-293)]` `=-1024 + 293 =- 731 KJ` |
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