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From the following data of heats of comb...

From the following data of heats of combustion, find the heat of formation of `CH_(3)OH(l)`
`CH_(3)OH(l)+(3)/(2)O_(2)(g)toCO_(2)(g)+2H_(2)O(l),DeltaH=-726kJ`
`C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-394kJ`
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),DeltaH=-286kJ`

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`-240kJ" "mol^(-1)`.
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