Neco Model Questions Vol1 2017 Chemistry Question 4

Practice practical question 4 from the 2017 Neco Model Questions Vol1 Chemistry examination. This question covers Mole Concept .

Neco Model Questions Vol1 2017 Chemistry Practical

Topic: Mole Concept

Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • practical

A volatile liquid was examined by the eudiometer method to determine its molar mass. The following data were recorded: - Mass of empty eudiometer flask (dry) = 45.00 g - Mass of flask containing the liquid before heating = 46.20 g - Volume of gas collected after complete vaporisation = 0.850 L (measured at 298 K and 750 mmHg) - The gas collected is dry (no water vapour present). Using the ideal gas equation, answer the questions below:

Question Parts

( a )

Calculate the number of moles of gas collected.

( b )

Determine the experimental molar mass of the volatile liquid.

( c )

The accepted molar mass of the liquid is 28.0 g·mol⁻¹. Suggest two possible reasons for the discrepancy between the experimental and accepted values.

( d )

Explain why the ideal gas equation is applicable in this experiment.

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About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 4. It is one of the practical questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

The question covers Mole Concept .

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