Neco 2023 Chemistry Question 5

Practice essay / theory question 5 from the 2023 Neco Chemistry examination. This question covers Stoichiometry .

Neco 2023 Chemistry Essay / Theory

Topic: Stoichiometry

Question 5 NECO • 2023 • CHEMISTRY • essay

A 5.00 g sample of a heterogeneous mixture containing magnesium metal (Mg) and calcium carbonate (CaCO3) is heated strongly in a crucible. The magnesium reacts with oxygen from the air to form magnesium oxide (MgO) while calcium carbonate decomposes to calcium oxide (CaO) and carbon dioxide gas (CO2). After heating, the solid residue remaining in the crucible is collected and weighed as 4.12 g.

( a )

Write the balanced chemical equations for the reactions that occur on heating the mixture.

( b )

Determine which component of the original mixture is the limiting reagent for the overall solid‑product formation.

( c )

Calculate the mass of magnesium metal that was present in the original 5.00 g mixture.

( d )

If the actual mass of MgO obtained after heating is 2.30 g, calculate the percent yield of MgO.

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This is Neco 2023 Chemistry Question 5. It is one of the essay questions from the 2023 Neco Chemistry examination.

The question covers Stoichiometry .

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