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Bond Order and Enthalpy

The heat of f...

Question

The heat of formation of $C O_{2}$ is $- 96 k c a l$ . The amount of carbon which on burning will evolve 1000 kcal is:

12.63 g

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17.95 g

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126.3 g

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179.5 g

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Solution

The correct option is B 126.3 g
$C (s) + O_{2} (g) \to C O_{2} (g)$
$Δ H_{I}^{0} (C O_{2}) = - 95 k c a l m o l^{- 1}$
$= - 95 k c a l / 12 g$ of carbon
Thus, carbon required for 1000 kcal of heat
$= \frac{12 \times 1000}{95}$
$= 126.3 g$

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