1.

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

Answer»

723 kJ
964 kJ
482 kJ
241 kJ

Solution :`underset(2 mol)(2CH_(3)OH) + underset(3 mol)(3O_(2)) rarr 2CO_(2) + 4H_(2)O Delta H = - 723 kJ mol^(-1)`
1 mol of `O_(2) = (2)/(3)` mol of `CH_(3)OH`
:. `(2)/(3)` mol of `CH_(3)OH` on COMBUSTION gives
`= (723 xx 2)/(3)` = 482 kJ


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