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IB Chemistry SL 2.1.2 Mole Ratio Questions

Use real SL exam questions to convert between masses, moles, volumes and concentrations with balanced-reaction ratios.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Use a balanced equation to convert the amount of one reactant or product into the stoichiometric mole amount of another chemical species.
  • Calculate moles from mass, concentration or volume before applying the balanced-equation mole ratio and report the requested amount or volume.
  • State the mole ratio in the requested direction with named chemical species and retain units through the final mass, volume or concentration conversion.

Learn this topic

Study 2.1.2—Mole ratio conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry SL 2.1.2 Mole Ratio Questions question 1

[Maximum number: 2]

The reaction between ethanoic acid and ethanol is homogeneous and reversible.

C2H6O(l)+C2H4O2(l)⇌C4H8O2(l)+H2O(l)ΔHθr=−4 kJ mol−1\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}(\mathrm{l})+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}(\mathrm{l}) \rightleftharpoons \mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{2}(\mathrm{l})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \quad \Delta H^{\theta}{ }_{\mathrm{r}}=-4 \mathrm{~kJ} \mathrm{~mol}^{-1}

0.6\quad 0.6 moles each of ethanol and ethanoic acid at 60∘C60^{\circ} \mathrm{C} reacted in the presence of an acid catalyst. The volume remained constant. At equilibrium 0.2 moles of ethanoic acid remained in the reaction mixture.

Calculate the amounts, in mol, of ethanol, ethyl ethanoate and water at equilibrium.

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