Neco 2023 Chemistry Question 4

Practice essay / theory question 4 from the 2023 Neco Chemistry examination. This question covers mole concept, empirical and molecular formula, percent composition, stoichiometry, combustion analysis .

Neco 2023 Chemistry Essay / Theory

Topics: mole concept empirical and molecular formula percent composition stoichiometry combustion analysis

Question 4 NECO • 2023 • CHEMISTRY • essay

The diagram shows the structural formula of an organic compound X.

Question Parts

( a )

Write the molecular formula of X as indicated by the diagram.

( b )

Calculate the percent by mass of carbon in X. Show all steps.

( c )

A 180 g sample of X is dissolved in water. (i) Determine the number of moles of X present. (ii) Using the mole concept, calculate the mass of carbon contained in this sample.

( d )

When X undergoes complete combustion with excess oxygen, it follows the balanced equation: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O. If 0.25 mol of X reacts completely, calculate the volume (in litres) of CO2 gas produced at STP (22.4 L·mol⁻¹).

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About This Question

This is Neco 2023 Chemistry Question 4. It is one of the essay questions from the 2023 Neco Chemistry examination.

The question covers mole concept, empirical and molecular formula, percent composition, stoichiometry, combustion analysis .

View More Neco 2023 Chemistry Questions More Neco Practice Questions Back to Questions

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