Neco 2017 Chemistry Question 5

Practice essay / theory question 5 from the 2017 Neco Chemistry examination. This question covers Stoichiometry, Limiting reagent, Percent purity .

Neco 2017 Chemistry Essay / Theory
Topics: Stoichiometry Limiting reagent Percent purity
Question 5 NECO • 2017 • CHEMISTRY • essay

A 5.00 g sample of a mixture containing metallic magnesium (Mg) and magnesium oxide (MgO) is treated with excess hydrochloric acid. The reactions are: \(\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2\) \(\text{MgO} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2\text{O}\) The total volume of hydrogen gas collected over water at 25 °C and 1 atm (after correcting for water vapour pressure) is 1.12 L. Determine:

Question Parts

( a )
The mass of pure magnesium present in the original mixture.
( b )
The mass of magnesium oxide present in the mixture.
( c )
The percent purity of magnesium in the original mixture (expressed to one decimal place).

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About This Question

This is Neco 2017 Chemistry Question 5. It is one of the essay questions from the 2017 Neco Chemistry examination.

The question covers Stoichiometry, Limiting reagent, Percent purity .

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