Neco Model Questions Vol1 2022 Chemistry Question 1

Practice practical question 1 from the 2022 Neco Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Neco Model Questions Vol1 2022 Chemistry Practical

Topic: Atomic Structure

Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • practical

A student carried out an experiment to determine the relative atomic mass of magnesium by reacting a weighed piece of magnesium ribbon with excess hydrochloric acid and collecting the hydrogen gas over water. Data supplied: - Mass of dry magnesium ribbon used: 0.500 g - Volume of gas collected over water: 620 mL - Temperature of the gas: 25 °C - Atmospheric pressure: 760 mmHg - Water‑vapour pressure at 25 °C: 23.8 mmHg - The reaction is: Mg (s) + 2 HCl (aq) → MgCl₂ (aq) + H₂ (g)

Question Parts

( a )

Calculate the number of moles of hydrogen gas collected, correcting for the presence of water vapour.

( b )

Using the stoichiometry of the reaction, calculate the experimental relative atomic mass of magnesium.

( c )

Identify two likely sources of error in this experiment and suggest one practical way to minimise each error.

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About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 1. It is one of the practical questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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