Gce Model Questions Vol1 2025 Chemistry Question 4

Practice essay / theory question 4 from the 2025 Gce Model Questions Vol1 Chemistry examination. This question covers mole concept, empirical formula, molecular formula, percentage composition, combustion stoichiometry, solution preparation .

Gce Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: mole concept empirical formula molecular formula percentage composition combustion stoichiometry solution preparation
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

The structural diagram of an organic compound is shown in the illustration. The diagram depicts a straight chain of six carbon atoms (C1–C6). Each of the first five carbon atoms (C1–C5) is bonded to a single hydroxyl group (–OH). The sixth carbon atom (C6) is bonded to a –CH2OH group, i.e., it is attached to a hydroxyl group and two hydrogen atoms. The molar mass of the compound is given as 180 g·mol⁻¹.

Question Parts

( a )
From the structural diagram, determine the empirical formula of the compound.
( b )
Using the empirical formula obtained in part (a) and the given molar mass (180 g·mol⁻¹), calculate the molecular formula of the compound.
( c )
Calculate the percentage by mass of carbon, hydrogen and oxygen in the compound.
( d )
A 2.50 g sample of the compound is completely combusted in excess oxygen.
( ) Write the balanced chemical equation for the combustion of the compound.
( ) Calculate the volume of CO₂ produced at STP.

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About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 4. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

The question covers mole concept, empirical formula, molecular formula, percentage composition, combustion stoichiometry, solution preparation .

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