Question

For the reaction C2H4+3O2=2CO2+2H2O, deltaE=-1415kJ.The deltaH at 27°C would be?

Answer 1

Explanation:

estimate Delta H for the following reaction

C2H4 (g)+3O2(g)→2 CO2(g)+2 H2O(g)

So we have (4) C-H bonds and (1) C=C bond or (H = 4*414 + 615= 2271)

For oxygen,

(3) O=O bonds or (H = 3*502=1506)

2CO2 is (2) O=C=O

(H=730*4=2920)

2H2O is (2) H-O-H

or (H=4*464=1856)

Delta H =(2271+1506)-(2920+1586)=-729

But the actual answer is -1614.

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Answer 2

Explanation:

estimate Delta H for the following reaction

C2H4 (g)+3O2(g)→2 CO2(g)+2 H2O(g)

So we have (4) C-H bonds and (1) C=C bond or (H = 4*414 + 615= 2271)

For oxygen,

(3) O=O bonds or (H = 3*502=1506)

2CO2 is (2) O=C=O

(H=730*4=2920)

2H2O is (2) H-O-H

or (H=4*464=1856)

Delta H =(2271+1506)-(2920+1586)=-729

But the actual answer is -1614.

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