Neco 2017 Chemistry Question 4

Practice practical question 4 from the 2017 Neco Chemistry examination. This question covers Mole Concept, Gas laws, Percentage purity .

Neco 2017 Chemistry Practical

Topics: Mole Concept Gas laws Percentage purity

Question 4 NECO • 2017 • CHEMISTRY • practical

A piece of magnesium ribbon is used to determine its purity by reacting it with excess hydrochloric acid and collecting the hydrogen gas over water. Data obtained are: - Mass of dry magnesium ribbon before the experiment: 0.1500 g - Volume of hydrogen gas collected over water: 112.0 mL - Atmospheric pressure: 760 mmHg - Temperature of the gas: 25 °C - Vapor pressure of water at 25 °C: 23.8 mmHg Assuming the reaction proceeds according to Mg + 2HCl → MgCl₂ + H₂, calculate the percent purity of the magnesium sample.

( a )

Correct the pressure of the collected hydrogen for the water vapour and calculate the pressure of dry H₂ in atmospheres.

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This is Neco 2017 Chemistry Question 4. It is one of the practical questions from the 2017 Neco Chemistry examination.

The question covers Mole Concept, Gas laws, Percentage purity .

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