1.

DeltaH_(f)^@ (298K) of methanol is given by the chemical equation,

Answer»

`CH_(4)(g)+(1)/(2)O_(2)(g) to CH_(3)OH(g)`
`C("graphite")+(1)/(2)O_(2)(g)+2H_(2)(g)toCH_(3)OH(l)`
`C("graphite")+(1)/(2)O_(2)(g)+2H_(2)(g) to CH_(3)OH(l)`
`CO(g)+2H_(2)(g) to CH_(3)OH (l)`

Solution :Heat of formation of DEFINED as the heat exchanged when one mole of a substance is FORMED from its constituent elements of a substance is formed from its constituent element at STP. In case of allotrpes,most stable ALLOTROPE is taken into account. Among graphite and diamond, graphite is stable. hence, heat of formation of `CH_(3)OH` is represented by equation.
`C("graphite")+(1)/(2)O_(2)(g)+2H_(2)(g) to CH_(3)OH(l)`


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