Waec Model Questions Vol1 2019 Chemistry Question 6

Practice essay / theory question 6 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers States of Matter .

Waec Model Questions Vol1 2019 Chemistry Essay / Theory

Topic: States of Matter

Question 6 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay

A sample of an unknown volatile liquid is placed in a 250.0 cm³ sealed flask at 298 K. After the liquid evaporates completely, the pressure inside the flask rises to 420 mmHg. The vapour pressure of water at 298 K is 23.8 mmHg. Answer the following:

Question Parts

( a )

Calculate the number of moles of the vapour (excluding water vapour) present in the flask.

( b )

If the molar mass of the liquid is 78.1 g mol⁻¹, determine the mass of the liquid that was originally placed in the flask.

( c )

Explain, with reference to intermolecular forces, why this liquid has a relatively high boiling point compared with water.

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About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 6. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Chemistry examination.

The question covers States of Matter .

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