1.

One mole of methanol when burnt in O_(2), gives out 723 kJ mol^(-1) heat. If one mole of O_(2) is used, what will be the amount of heat evolved

Answer»

723 kJ
924 kJ
482 kJ
241 kJ

Solution :`CH_(3)OH(L)+(3)/(2)O_(2)(G)rarrCO_(2)(g)+2H_(2)O(l) DeltaH=-723 kJ`
By burning with `(3)/(2)O_(2)(g)` heat evolved =-723 kJ
`therefore` By burning with 1 mole `O_(2)(g)=(-723xx2)/(3)=-482 kJ`.


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