Answer to Question #286301 in Physical Chemistry for Gio cavani

Question

Topi:Thermodynamics 

Q1

Given the following bond energy data: (Bond and AH_b kJmol-1)

• Bond C-H and AH_b +413 kJmol-1
• Bond C-Br and AH_b +285 kJmol-1
• Bond C-CI and AH_b +328 kJmol-1
• Bond Br-Br and AH_b +193 kJmol-1
• Bond C-C and AH_b +347 kJmol-1

• Bond C=C and AH_b +611 kJmol-1

• Bond H-CI and AH_b +428 kJmol-1
• Bond CI-CI and AH_b +428 kJmol-1

Calculate the theoretical enthalpy changes for the following reactions:

a) C2H4 + Br2 —> C2H4Br2

b) CH4 + CI2 ——> CH3CI + HCI

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Answer 1

The enthalpy change of a reaction is the enthalpy change when the number of moles of reactants as specified in a balanced equation react together.