University:
Concordia University Wisconsin
Course:
CHEM 1414 | General Chemistry I
Academic year:

2020
Views:

398

Pages:

1
Author:

ilikemyicons0y5

Wkst 1.2: Activation Energy Worksheet Energy diagram 1: i) ii) iii) iv) v) vi) ΔH = -40 kJ/mol Exothermic reaction Eaf = 60 kJ/mol Ear = 100 kJ/mol Preferred reaction direction: forward (energetically favoured by minimum enthalpy) Since only one step, it must be the rate-determining one! Energy diagram 2: i) ΔH = 30 kJ/mol ii) Endothermic reaction iii) Eaf = 50 kJ/mol iv) Ear = 20 kJ/mol v) Preferred reaction direction: reverse (favoured by minimum enthalpy) vi) Since only one step, it must be the rate-determining one! Energy diagram 3: i) ΔH = 10 kJ/mol ii) Endothermic reaction iii) Eaf for each step = 30 kJ/mol, 20 kJ/mol, 80 kJ/mol iv) Ear for each step = 50 kJ/mol, 40 kJ/mol, 30 kJ/mol v) Preferred reaction direction: reverse (favoured by minimum enthalpy) vi) Rate-determining step = step 3 (for forward reaction) Preferred reaction direction is favoured by minimum enthalpy (i.e. favours the direction of the EXOTHERMIV REACTION AND also favoured by Minimum Ea for the Rate Determining Step (the step with the largest Ea value) Energy diagram 4: i) ΔH = -5 kJ/mol ii) Exothermic reaction iii) Eaf for each step = 15 kJ/mol, 15 kJ/mol, 2.5 kJ/mol iv) Ear for each step = 12.5 kJ/mol, 5 kJ/mol, 20 kJ/mol v) Preferred reaction direction: forward (favoured by minimum enthalpy) vi) Rate-determining step: step 1 (for forward reaction)