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Combustion Reactions

21. At 300 K ...

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21. At 300 K standard enthalpy of formation of C6H5COOH(s), CO2(g), and H2O(l) are -408, -393, and -286 kj per mol respectively. Calculate heat of combustion of benzoic acid at constant volume

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300

K the standard enthalpies of formation of

C_{6} H_{5} C O O H_{(s)}, C O_{2 (g)}

H_{2} O_{(l)}

- 408, - 393

- 286

m o l^{- 1}

respectively. Calculate the heat of combustion of benzoic acid at constant volume.

Q. At 300K, the standard enthalpies of formation of

C_{6} H_{5} C O O H_{(s)}, C O_{2 (g)},

H_{2} O_{(l)}

are -408, -393 and -286 kJ mol respectively. Calculate the heat of combination of benzoic acid at constant volume.

Q. At 300 K , the standard enthalpies of formation of

C_{6} H_{5} C O O H (s)

C O_{2} (g)

H_{2} O (l)

are ; -408, -393 , & -286 kJ mol respectively.
Calculate the heat of combustion of benzoic acid at:
(i) constant pressure
(ii) constant value

300 K

, the standard enthalpies of formation of

C_{6} H_{5} C O O H (s), C O_{2} (g)

H_{2} O (l)

- 408, - 393

- 286

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

respectively. Calculate the heat of combustion of benzoic acid at (i) constant pressure and (ii) constant volume.

(R = 8.31 J {m o l}^{- 1} K^{- 1})

Q. The standard enthalpy of formation of octane

(C_{8} H_{18})

- 250 k J / m o l

. Calculate the enthalpy of combustion of

C_{8} H_{18}

.
Given : enthalpy of formation of

C O_{2} (g)

H_{2} O (l)

- 394 k J / m o l

- 286 k J / m o l

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