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  4. The heat of formation of CO2 is -95 text kcal . The amount of carbon which on burning will evolve 1000 kcal is

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Q. The heat of formation of $ C{{O}_{2}} $ is $ -95\text{ }kcal $ . The amount of carbon which on burning will evolve 1000 kcal is

ManipalManipal 2013Chemical Bonding and Molecular Structure

Solution:

$ C(s)+{{O}_{2}}(g)\xrightarrow[{}]{{}}C{{O}_{2}}(g) $
$ \Delta H_{f}^{o}(C{{O}_{2}})=-\text{ }95\text{ }kcal\text{ }mo{{l}^{-1}} $
$ =-95 $ kcal/12g of carbon
Thus, carbon required for 1000 kcal of heat
$ =\frac{12\times 1000}{95} $
$ =126.3g $