1.

Carbon and carbon monoxide burn in oxygen to form carbon dioxide according to the following reactionsC+O_(2)rarrCO_(2), DeltaH=-394 " kJ mol"^(-1)2CO+O_(2)rarr2CO_(2),DeltaH=-569 " kJ mol"^(-1)The heat of formation of 1 mol of carbon monoxide is thus

Answer»

`-219.0 kJ mol^(-1)`
`-109.5 kJ mol^(-1)`
`-175.0 kJ mol^(-1)`
`-87.5 kJ mol^(-1)`

Solution :`C+O_(2)rarrCO_(2)+394 kJ "….(i)"`
`2C+2O_(2)rarr2CO_(2)+788 kJ "….(ii)"`
`2CO_(2)+O_(2)rarr2CO_(2)+569 kJ "….(iii)"`
`2CO_(2)rarr2CO+O_(2)-569 kJ "….(IV)"`
EQ. (ii) +eq. (iv) = - 109.5 kJ`mol^(-1)`.


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