1.

On combustion carbon forms two oxides CO and CO_(2). Heat of formation of CO_(2) is -393.5kJ and that of CO is -110.5kJ. Heat of combustion of CO is

Answer»

`-393.5kJ`
`-504.0kJ`
`-283.0kJ`
283.0kJ

Solution :(i) `C + (1)/(2)O_(2)(g) rarr CO, Delta H = - 110.5 kJ`
(ii) `C + O_(2)(g) rarr CO_(2), Delta H = - 393.5 kJ`
SUBTRACT EQ. (i) from eq. (ii),
`CO + (1)/(2)O_(2) rarr CO_(2), Delta H = - 283.0 kJ`


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