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Calorimetry

The heat of c...

Question

The heat of combustion of carbon is $94$ kcal. The calorific value of carbon is about:

A

7.8

kcal

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B

15.6

kcal

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C

47.0

kcal

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D

94

kcal

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Solution

The correct option is A $7.8$ kcal
The calorific value of a substance is the heat which it releases during combustion of its $1 g m$ solid.
Therefore, $Calorific value (C . V) = \frac{Heat of combustion}{Mol. weight} C + O_{2} ⟶ C O_{2}; △ H = - 94 K c a l C . V = \frac{- 94}{12} K c a l = - 7.83 K c a l$

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