Neco Model Questions Vol1 2022 Chemistry Question 4

Practice essay / theory question 4 from the 2022 Neco Model Questions Vol1 Chemistry examination. This question covers Mole concept, Molar mass, Hydrates .

Neco Model Questions Vol1 2022 Chemistry Essay / Theory
Topics: Mole concept Molar mass Hydrates
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • essay
Neco Model Questions Vol1 2022 Chemistry Question 4 diagram

A white crystalline solid shown in the labelled diagram is a hydrate of magnesium sulphate. The diagram represents the composition of the compound as magnesium ion (Mg²⁺) coordinated to a tetrahedral sulphate ion (SO₄²⁻) together with seven water molecules of crystallisation. A 2.50 g sample of this solid is taken for analysis.

Question Parts

( a )
Calculate the number of moles of the hydrate present in the 2.50 g sample. Show all steps, including the determination of the molar mass from the formula shown in the diagram.
( b )
From the result in (a), determine the number of moles of water of crystallisation present in the sample.
( c )
If the sample is heated strongly to remove all water of crystallisation, calculate the mass of the anhydrous MgSO4 that would remain.
( d )
Determine the percentage by mass of magnesium (Mg) in the original 2.50 g sample.

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About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 4. It is one of the essay questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

The question covers Mole concept, Molar mass, Hydrates .

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