Question 1
Ethene reacts with hydrogen as shown: C₂H₄(g) + H₂(g) → C₂H₆(g). Average bond enthalpies in kJ mol⁻¹: C=C 614, C-C 346, C-H 414, H-H 436. What is ΔH for the reaction?
The chemistry data booklet: how to use it in the exam
The booklet gives data and equations, not the chemistry. Practise with your school's copy of the current booklet.
| Your copy | From your school, for the course first assessed in 2025 |
|---|---|
| Calculator | Allowed. The IB lists approved calculators for schools |
What it will not do
- Choose the equation or the mole ratio for you.
- Tell you which value applies (average bond enthalpy, standard conditions).
- Explain a trend or a mechanism in Paper 2.
Try 2 questions
Question 2
Which functional group is present in the compound shown?
Next step
Questions people ask
Can I use an older data booklet?
Use the one for the course first assessed in 2025; an older booklet may not match.
Do I still need to learn equations?
You need to know what each relation means, when it applies and how to rearrange it.