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Coal and Its Fomation

39 The heat o...

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39 The heat of combustion of ethene (C.H)is -1409.3 kJ/mol. Calculate the weight ofethene required to produce 470 kJ of heat oncombustion.(2) 9.34 g(1) 12.5 g(4) 18.4 g(3) 23 g

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Q. Calculate the heat of combustion of ethene

C H_{2} = C H_{2} (g) + 3 O_{2} (g) \to 2 C O_{2} (g) + 2 H_{2} O (I)

The bond energy data are given below

C = C = 619 k J m o l^{- 1}

C - H = 414 k J m o l^{- 1}

O = O = 499 k J m o l^{- 1}

C = O = 724 k J m o l^{- 1}

O - H = 460 k J m o l^{- 1}

Q. The heat of combustion of

C_{2} H_{4}, C_{2} H_{6}

H_{2}

gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is :

Q. The heat of carbon combustion with the

{C O}_{2}

- 393.5 K J / m o l

, and the heat of

C O

combustion with the formation of

{C O}_{2}

- 283 K J / m o l

. calculate the heat of combustion of carbon there in

C O

Q. The heat of combustion of benzene in a bomb calorimeter (i.e., constant volume) was found to be

3263.9 k J m o l^{- 1}

25^{o} C

. Calculate the heat of combustion of benzene at constant pressure.

Q. Calculate heat of combustion of ethene (figure) from bond energy data:

C = C, C - H, O = O, C - O, O - H

B E (k J {m o l}^{- 1}) : 619, 414, 499, 724, 460

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