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The standard enthalpies of formation of ...

The standard enthalpies of formation of `SO_2` and `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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`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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