Waec Model Questions Vol1 2020 Chemistry Question 4

Practice essay / theory question 4 from the 2020 Waec Model Questions Vol1 Chemistry examination. This question covers mole concept, combustion analysis, empirical formula, molecular formula, isomerism .

Waec Model Questions Vol1 2020 Chemistry Essay / Theory
Topics: mole concept combustion analysis empirical formula molecular formula isomerism
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • essay

The diagram shows the structural formula of a colourless liquid compound X, which contains only carbon (C), hydrogen (H) and oxygen (O) atoms. The molecular mass of X has been determined as 320 g mol⁻¹ by mass‑spectrometry. A 1.00 g sample of X was completely combusted and the combustion products were collected. The experiment gave 2.20 g of carbon dioxide (CO₂) and 0.90 g of water (H₂O).

Question Parts

( a )
Calculate the mass of carbon, hydrogen and oxygen present in the original 1.00 g sample of X.
( b )
Using the masses obtained in part (a), determine the empirical formula of X.
( c )
Given that the molar mass of X is 320 g mol⁻¹, deduce the molecular formula of X.
( d )
The structural diagram of X is shown. Another compound Y has the same molecular formula as X but a different arrangement of the functional groups. Identify the type of isomerism exhibited between X and Y and justify your answer.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Waec Model Questions Vol1 2020 Chemistry Question 4. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Chemistry examination.

The question covers mole concept, combustion analysis, empirical formula, molecular formula, isomerism .

View More Waec Model Questions Vol1 2020 Chemistry Questions More Waec Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support