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Find the formation enthalpy of SO(3) fro...

Find the formation enthalpy of `SO_(3)` from the enthalpy of given reactions.
`S_(8(s)) + 8O_(2(g)) to 8SO_(2(g)) , DeltaH= -2775` kj/mol
`2SO_(2(g)) + O_(2(g)) to 2SO_(3(g)) , DeltaH= - 198` kj/mol

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`-445.9` k.cal/mole
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