Igcse Model Questions Vol1 2022 Chemistry Question 4

Practice practical question 4 from the 2022 Igcse Model Questions Vol1 Chemistry examination. This question covers Mole Concept .

Igcse Model Questions Vol1 2022 Chemistry Practical
Topic: Mole Concept
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • practical

A volatile liquid of unknown composition is to be investigated by the gas‑evolution method in order to determine its molar mass.

Question Parts

( a )
Describe a suitable experimental set‑up and the steps required to obtain the pressure of the vapour produced when a known mass of the liquid is vapourised in a sealed container.
( b )
The experiment gave the following data: mass of liquid = 0.250 g, volume of gas collected = 250 mL, total pressure = 750 mmHg, temperature = 298 K, water‑vapour pressure = 23 mmHg. Using R = 0.0821 L·atm·mol⁻¹·K⁻¹, calculate the number of moles of vapour present.
( c )
From the result obtained in part (b), calculate the molar mass of the liquid.
( d )
Discuss two possible systematic errors in this method and indicate how each would affect the calculated molar mass (whether it would be over‑ or under‑estimated).

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About This Question

This is Igcse Model Questions Vol1 2022 Chemistry Question 4. It is one of the practical questions from the 2022 Igcse Model Questions Vol1 Chemistry examination.

The question covers Mole Concept .

View More Igcse Model Questions Vol1 2022 Chemistry Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

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