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Enthalpy of Combustion

Which of the ...

Question

Which of the following is the set of products formed when propanol, $C_{2} H_{2} O H$ , undergoes a combustion reaction?

A

C O_{2 (g)}

and

H_{2} O_{(l)}

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B

C O_{2 (g)}

and

H_{2} O_{(g)}

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C

C_{(a)}, O_{2 (g)}

and

H_{2} O_{(g)}

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D

C_{(a)}, H_{2 (g)}

and

H_{2} O_{(g)}

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E

C O_{2 (g)}, H_{2} O_{(g)}

and

O_{2 (g)}

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Solution

The correct option is E $C O_{2 (g)}$ and $H_{2} O_{(g)}$
The reaction for the combustion of propanol is given by
$C_{3} H_{7} O H + 9 O_{2} \to 6 C O_{2} + 8 H_{2} O$
Combustion reaction takes place in sufficient oxygen so $C O_{2}$ will form.
If we will burn it in insufficient oxygen then carbon monoxide will form.

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Similar questions

Q. From the given data of equilibrium constants of the following reactions,

C a O (s) + H_{2} (g) ⇌ C a (s) + H_{2} O (g); K = 60

C a O (s) + C O (g) ⇌ C a (s) + C O_{2} (g); K = 400

Calculate the equilibrium constant of the reaction,

C O_{2} (g) + H_{2} (g) ⇌ C O (g) + H_{2} O (g)

Q. From the given data of the following reactions;

C a O (s) + H_{2} (g) ⇌ C a (s) + H_{2} O (g)

K = 670

C a O (s) + C O (g) ⇌ C a (s) + C O_{2} (g)

K = 490

K_{c}

(nearest integer) for the given reaction is _____.

C O_{2} (g) + H_{2} (g) ⇌ C O (g) + H_{2} O (g)

Δ H

k J

for the following reaction:

C (g) + O_{2} (g) \to C O_{2} (g)

H_{2} O (g) + C (g) \to C O (g) + H_{2} (g)

Δ H = + 131 k J

C O (g) + \frac{1}{2} O_{2} (g) \to {C O}_{2} (g)

Δ H = - 282 k J

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (g)

Δ H = - 242 k J

Δ H_{f}^{o}

C O_{2 (g)}, C O_{(g)}

H_{2} O_{(g)}

- 393.5, - 110.5

- 241.8

k J . m o l^{- 1}

, respectively. The

Δ H_{f}^{o}

k J . m o l^{- 1}

] for the reaction,

C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}

Δ H_{t}^{\circ}

C O_{2 (g)}, C O_{(g)}

H_{2} O_{(g)}

- 393.5, - 110.5

- 241.8 k J m o l^{- 1}

respectively the standard enthalpy change (in

K J

) for the reaction

C O_{2 (g)} + H_{2 (g)} \to C O_{(g)} + H_{2} O_{(g)}

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