Waec Model Questions Vol1 2021 Chemistry Question 4

Practice essay / theory question 4 from the 2021 Waec Model Questions Vol1 Chemistry examination. This question covers mole concept .

Waec Model Questions Vol1 2021 Chemistry Essay / Theory
Topic: mole concept
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Waec Model Questions Vol1 2021 Chemistry Question 4 diagram

The diagram shows the crystal structure of copper(II) sulfate pentahydrate, CuSO₄·5H₂O. In the structure each Cu²⁺ ion is octahedrally coordinated to four water molecules and two oxygen atoms belonging to two different sulfate ions. The sulfate ion is depicted as a tetrahedron with the S atom at the centre bonded to four O atoms.

Question Parts

( a )
Write the correct molecular formula of the compound shown in the diagram.
( b )
A 12.5 g sample of the compound is heated strongly to expel the water of crystallisation, leaving anhydrous CuSO₄. (i) Calculate the number of moles of water removed. (ii) Calculate the mass of the anhydrous CuSO₄ obtained.
( c )
The anhydrous CuSO₄ is further heated and decomposes according to: CuSO₄ → CuO + SO₃. (i) Calculate the number of moles of CuO produced. (ii) Calculate the mass of CuO obtained.
( d )
The CuO obtained is dissolved in excess aqueous H₂SO₄ to give a solution containing Cu²⁺ ions. (i) Write the net ionic equation for the dissolution. (ii) State the total number of moles of Cu²⁺ ions present in the final solution.

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About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 4. It is one of the essay questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

The question covers mole concept .

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