iii) Bond energy term for the C-H bond. The enthalpy of hydrogenation of But-1-ene (CH2 = CH-CH2-CH3) is - 127 KJmol but the value for Buta-1, 3-diene (CH2 = CH-CH = CH2) is not - 254KJM- as might be expected, but-239KJmol". How do you account for this? b) %3D %3D

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Chapter1: Chemical Foundations
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Question b(i) , (ii) and (iii) from Q14.jpeg and b) from Q15.jpeg

i)
Bond energy term for the C-H bond.
The enthalpy of hydrogenation of But-1-ene (CH2 = CH-CH2-CH3) is
-127 KJmol but the value for Buta-1, 3-diene (CH2 = CH-CH = CH2) is not - 254KJM
as might be expected, but -239KJmol". How do you account for this?
b)
%3D
%3D
%3D
....
Transcribed Image Text:i) Bond energy term for the C-H bond. The enthalpy of hydrogenation of But-1-ene (CH2 = CH-CH2-CH3) is -127 KJmol but the value for Buta-1, 3-diene (CH2 = CH-CH = CH2) is not - 254KJM as might be expected, but -239KJmol". How do you account for this? b) %3D %3D %3D ....
b)
You are given the following thermochemical data:
Standard Enthalpy of
Standard Enthalpy of Combustion
AH c/KJMOI1
atomisation AHa/KJMOI
C(graphwie)
H2(g)
- 394
715
- 286
218
CHG
Calculate the following:
- 891
Standard enthalpy of formation of methane.
i)
the enthalpy of atomisation of methane.
Transcribed Image Text:b) You are given the following thermochemical data: Standard Enthalpy of Standard Enthalpy of Combustion AH c/KJMOI1 atomisation AHa/KJMOI C(graphwie) H2(g) - 394 715 - 286 218 CHG Calculate the following: - 891 Standard enthalpy of formation of methane. i) the enthalpy of atomisation of methane.
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