IB Chemistry HL 2.1.5 Atom Economy Questions

Use real HL exam reactions to calculate atom economy and explain how product composition affects chemical waste.

Exam points

Calculate atom economy from the relative formula mass of the desired product and total reactants in the balanced equation, multiplied by 100%.
Apply stoichiometric coefficients and relative atomic masses to compare atom economy for extraction, oxidation, polymerization or organic reactions.
Explain how the fraction of reactant atoms entering the desired product determines atom economy and waste, including 100% addition reactions.

[Maximum number: 1]

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

Calculate the atom economy of the reaction.

$\begin{aligned} \mu 100 \times \frac{104.16}{106.18} =98.1 \% \end{aligned}$

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