Neco Model Questions Vol1 2018 Chemistry Question 4

Practice essay / theory question 4 from the 2018 Neco Model Questions Vol1 Chemistry examination. This question covers mole concept, molar mass, percentage composition, stoichiometry .

Neco Model Questions Vol1 2018 Chemistry Essay / Theory
Topics: mole concept molar mass percentage composition stoichiometry
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay
Neco Model Questions Vol1 2018 Chemistry Question 4 diagram

The labelled diagram shows the structure of a solid coordination compound consisting of a central copper ion surrounded by four ammonia ligands, a sulfate counter‑ion and one molecule of water of crystallisation.

Question Parts

( a )
Write the correct molecular formula of the compound shown in the diagram.
( b )
Calculate the molar mass of the compound (give your answer to three significant figures).
( c )
A sample weighing 2.50 g of the compound is dissolved in excess water. Calculate:
( ) Number of moles of Cu present.
( ) Mass of NH3 present.
( ) Mass percent of Cu in the compound.
( d )
The compound is used as a source of Cu²⁺ ions in a reaction. If 0.025 mol of the compound is added to a solution, how many moles of Cu²⁺ ions will be released? State any assumptions you make.

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About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 4. It is one of the essay questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

The question covers mole concept, molar mass, percentage composition, stoichiometry .

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