Ijmb Model Questions Vol1 2025 Chemistry Question 5

Practice essay / theory question 5 from the 2025 Ijmb Model Questions Vol1 Chemistry examination. This question covers Stoichiometry .

Ijmb Model Questions Vol1 2025 Chemistry Essay / Theory

Topic: Stoichiometry

Question 5 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

A mixture containing 12.0 g of calcium carbonate (CaCO₃) and 10.0 g of magnesium oxide (MgO) is heated strongly in a crucible. Calcium carbonate decomposes according to CaCO₃ → CaO + CO₂, while magnesium oxide remains unchanged. The calcium oxide formed reacts with excess aqueous hydrochloric acid according to CaO + 2 HCl → CaCl₂ + H₂O. After filtration, the calcium chloride solution is treated with excess sodium carbonate solution, precipitating calcium carbonate: CaCl₂ + Na₂CO₃ → CaCO₃↓ + 2 NaCl. The precipitate is dried and weighed, giving 5.00 g of CaCO₃.

Question Parts

( a )

Identify the limiting reagent in the decomposition of calcium carbonate and calculate the theoretical mass of CaO that could be produced from the mixture.

( b )

Using the 5.00 g of CaCO₃ recovered, calculate the overall percent yield for the sequence CaCO₃ → CaO → CaCl₂ → CaCO₃.

( c )

Determine the mass of magnesium oxide that remains unchanged after the heating step.

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About This Question

This is Ijmb Model Questions Vol1 2025 Chemistry Question 5. It is one of the essay questions from the 2025 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Stoichiometry .

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