Igcse Model Questions Vol1 2022 Chemistry Question 1

Practice practical question 1 from the 2022 Igcse Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Moles, Gas Laws, Stoichiometry .

Igcse Model Questions Vol1 2022 Chemistry Practical
Topics: Atomic Structure Moles Gas Laws Stoichiometry
Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • practical

A student determines the relative atomic mass of magnesium by reacting a known mass of magnesium ribbon with excess hydrochloric acid and collecting the hydrogen gas over water. Data recorded: - Mass of dry magnesium ribbon before reaction: 0.500 g - Mass of magnesium ribbon after reaction (dry): 0.380 g - Volume of gas collected over water: 125 mL - Temperature of the gas: 25 °C - Atmospheric pressure: 760 mmHg - Vapour pressure of water at 25 °C: 23.8 mmHg The reaction is: Mg + 2 HCl → MgCl₂ + H₂. Answer the following:

Question Parts

( a )
Calculate the pressure of the dry hydrogen gas collected (in mmHg and in atm).
( b )
Using the corrected pressure, calculate the amount of hydrogen gas collected in moles (use R = 0.0821 L·atm·mol⁻¹·K⁻¹).
( c )
From the reaction stoichiometry, state the number of moles of magnesium that have reacted.
( d )
Calculate the relative atomic mass of magnesium using the mass of magnesium that reacted.
( e )
Identify two possible sources of error in this experiment and suggest a method to reduce each error.

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About This Question

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

The question covers Atomic Structure, Moles, Gas Laws, Stoichiometry .

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