IB Chemistry SL Reactivity 2.1.5 Atom Economy

Practise evaluating how efficiently a balanced reaction incorporates reactant atoms into the desired product. Include stoichiometric coefficients in all formula-mass totals,…

Syllabus
First assessment 2025
Objective
2.1.5
Level
SL

Exam points

  • sum coefficient-weighted formula masses for every reactant in the balanced equation
  • divide the desired product's coefficient-weighted mass by the total and multiply by 100
  • compare routes by atom economy without confusing theoretical waste with experimental yield

2.1.5—Atom economy question 1

[Maximum number: 1]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

Figure for Question 2.1.5—Atom economy question 1 — IB Chemistry SL

Calculate the atom economy of the reaction.

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