Question

Benzene is not usually made using this reaction as the activation energy (EA) required is too high. The energy profile diagram below shows the activation energy for this reaction. c) Explain what is meant by ‘Activation energy’. d) If a catalyst was used in this reaction, describe how the activation energy level would change on this energy profile diagram (you do NOT need to explain why this occurs). Energy Activation Energy (EA) A + B C Progress of Reaction e) Use the information provided below to show how the enthalpy of formation was determined using Hess’ Law. You should include an enthalpy cycle diagram and show your workings clearly. Reaction | ?Hc (kJ mol-1) C + O2 ? CO2 | -393.4 H2 + 1/2O2 ? H2O | -285.8 C6H6 + 7 1/2O2 ? 6CO2 + 3H2O | -3278

          Benzene is not usually made using this reaction as the activation energy (EA) required is too high. The energy profile diagram below shows the activation energy for this reaction.

c) Explain what is meant by ‘Activation energy’.
d) If a catalyst was used in this reaction, describe how the activation energy level would change on this energy profile diagram (you do NOT need to explain why this occurs).

Energy
Activation Energy (EA)
A + B
C
Progress of Reaction

e) Use the information provided below to show how the enthalpy of formation was determined using Hess’ Law. You should include an enthalpy cycle diagram and show your workings clearly.

Reaction | ?Hc (kJ mol-1)
C + O2 ? CO2 | -393.4
H2 + 1/2O2 ? H2O | -285.8
C6H6 + 7 1/2O2 ? 6CO2 + 3H2O | -3278

Added by Julia B.

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