Neco Model Questions Vol1 2021 Chemistry Question 4

Practice essay / theory question 4 from the 2021 Neco Model Questions Vol1 Chemistry examination. This question covers Mole concept, Molar mass, Percentage composition, Solution preparation .

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topics: Mole concept Molar mass Percentage composition Solution preparation
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Neco Model Questions Vol1 2021 Chemistry Question 4 diagram

The diagram shows the crystal structure of copper(II) sulfate pentahydrate, CuSO₄·5H₂O. The Cu²⁺ ion is coordinated to a tetrahedral sulfate (SO₄²⁻) ion and five water molecules, each water molecule being labelled H₂O₁ to H₂O₅.

Question Parts

( a )
Calculate the molar mass of CuSO₄·5H₂O. Show all steps of your calculation.
( b )
A sample of CuSO₄·5H₂O weighing 12.5 g is heated until all water of crystallisation is removed, giving anhydrous CuSO₄. Calculate:
( ) The mass of water lost.
( ) The number of moles of water removed.
( ) The mass of the remaining anhydrous CuSO₄.
( c )
To prepare 250.0 mL of a 0.200 mol dm⁻³ CuSO₄ solution using the pentahydrate, calculate the mass of CuSO₄·5H₂O required. Show all steps.
( ) Moles of CuSO₄ required.
( ) Conversion to moles of the pentahydrate.
( ) Mass of CuSO₄·5H₂O to be weighed.
( d )
State two practical advantages of using CuSO₄·5H₂O rather than anhydrous CuSO₄ when preparing laboratory solutions.

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About This Question

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

The question covers Mole concept, Molar mass, Percentage composition, Solution preparation .

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