Neco 2018 Chemistry Question 4

Practice essay / theory question 4 from the 2018 Neco Chemistry examination. This question covers Mole concept, Empirical formula, Molecular formula, Molar mass, Stoichiometry .

Neco 2018 Chemistry Essay / Theory

Topics: Mole concept Empirical formula Molecular formula Molar mass Stoichiometry

Question 4 NECO • 2018 • CHEMISTRY • essay

The diagram shows the structural formula of a carbohydrate molecule. The carbon atoms are labelled C1 to C6 and the oxygen atoms are labelled O1 to O6. All hydrogen atoms are attached to the carbon or oxygen atoms as indicated in the diagram. Using the information from the diagram, answer the following:

Question Parts

( a )

Determine the empirical formula of the compound.

( b )

The experimentally determined molar mass of the compound is 180 g mol⁻¹. Using the empirical formula obtained in part (a), deduce the molecular formula of the compound.

( c )

A 2.70 g sample of the compound is dissolved in water. Calculate the number of moles of the compound present in the sample.

( d )

Based on the molecular formula, calculate the mass of carbon, hydrogen and oxygen respectively present in the 2.70 g sample.

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About This Question

This is Neco 2018 Chemistry Question 4. It is one of the essay questions from the 2018 Neco Chemistry examination.

The question covers Mole concept, Empirical formula, Molecular formula, Molar mass, Stoichiometry .

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