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Enthalpy of Solution

The heat of f...

Question

The heat of formation of $C_{2} H_{5} O H (l)$ is -66 kcal/mole. The heat of combustion of $C H_{3} O C H_{3} (g)$ is -348 kcal mole, $Δ H_{f}$ for $H_{2} O$ and $C O_{2}$ are - 68 kcal/mole and -94 kcal/mole respectively. Then determine the $Δ H$ for the isomerisation reaction $C_{2} H_{5} O C H_{3} (g)$ , and $Δ E$ for the same are at T = 25 $^{\circ}$ C

Δ H = 22 k c a l / m o l e, Δ E = 21.408 k a l / m o l e

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Δ H = 33 k c a l / m o l e, Δ E = 21.408 k a l / m o l e

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Δ H = 44 k c a l / m o l e, Δ E = 21.408 k a l / m o l e

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Δ H = 22 k c a l / m o l e, Δ E = 56.408 k a l / m o l e

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Solution

The correct option is A $Δ H = 22 k c a l / m o l e, Δ E = 21.408 k a l / m o l e$
$2 C O_{2} + 3 H_{2} O \to C_{2} H_{5} O H + O_{2}$ $Δ H_{1} = + 66 k c a l$ --------1
$C H_{3} O C H_{3} (g) + O_{2} \to 2 C O_{2} + 3 H_{2} O$ $Δ H_{2} = - 348 K c a l$ -----2
$Δ H (H_{2} O) = - 68 k c a l$
$Δ H (O_{2}) = - 94 k c a l$
$Δ H o f r e a c t i o n 2 = - 348 - (3 (- 68) + 2 (- 94)) = 44 k c a l$
By addition of of reactions
$C H_{3} O C H_{3} + O_{2} + 2 C O_{2} + 3 H_{2} O \to C_{2} H_{5} O H + O_{2} + 2 C O_{2} + 3 H_{2} O$
$Δ H = + 66 - 44 = 22 k c a l$
$Δ E = 21.408 k c a l / m o l$

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Similar questions

C H C l_{2} C O O H

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K C l_{(s)} ⟶ K^{+} + C l^{-}

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