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Asked by g_archanasharma | 20 Feb, 2019, 17:23: PM
Option (2) is correct.
Combustion of carbon:
![straight C space space plus space space straight O subscript 2 space rightwards arrow space CO subscript 2 space space space space space increment straight H subscript 1 space equals space minus 394 space kJ divided by mol
Combustion space of space Carnon space monoxide colon
CO space space plus space bevelled 1 half straight O subscript 2 space rightwards arrow space CO subscript 2 space space space increment straight H subscript 2 space equals space minus 285 space kJ divided by mol
Formation space of space carbon space monoxide colon
straight C space plus space bevelled 1 half straight O subscript 2 space space space rightwards arrow space CO space space space increment straight H space equals ?
increment straight H space equals space increment straight H subscript 1 space minus increment straight H subscript 2 space
space space space space space space space equals space minus 394 space minus open parentheses negative 285 close parentheses
increment straight H space space equals open parentheses negative 109 close parentheses space kJ divided by mol](https://images.topperlearning.com/topper/tinymce/cache/e4c1e406ed087d41f23de378051a9dfd.png)
The heat of formation of CO is -109 kJ/mol.
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