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Enthalpy of Combustion

2.2016 g of a...

Question

2.2016 g of acetaldehyde produced 13.9 kcal of heat on combustion in $O_{2}$ . Calculate the heat of combustion of $C H_{3} C O O H$ will be:

279 kcal

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972 kcal

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27.9 kcal

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2.79 kcal

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Solution

The correct option is C 279 kcal
molecular mass of $C H_{3} C H O$ = 44
heat = 13.95 kcal
$Δ H = \frac{13.95 \times 44}{2.2016} = 279 k c a l$

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