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The standard enthalpies of formation of SO_2and SO_3 are -297 "kJ mol"^(-1) 396 "kJ mol"^(-1) respectively. Calculate the standard enthalpy of reaction for the reaction:SO_2 + 1//2O_2 to SO_3 |
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Answer» SOLUTION :`DeltaH_(f)^(@)(SO_(2))=-297 "KJ mol"^(-1)` `DeltaH_(f)^(@)(SO_(3))=-396 "kJ mol"^(-1)` `SO_(2)+1/2O_(2)rarrSO_(3)DeltaH_(r)^(@)=?` `DeltaH_(r)^(@)=(DeltaH_(r)^(@))_("COMPOUND")-sum(DeltaH_(f))_("elements")` `DeltaH_(r)^(@)=DeltaH_(f)^(@)(SO_(3))-(DeltaH_(f)^(@)(SO_(2))+1/2DeltaH_(f)^(@)(O_(2)))` `DeltaH_(r)^(@)=-396" kJ mol"^(-1)-(-297" kJ mol "^(-1)+0)` `DeltaH_(r)^(@)=-396" kJ mol"^(-1)+297=-99 " kJ mol "^(-1)` |
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