Neco 2021 Chemistry Question 4

Practice essay / theory question 4 from the 2021 Neco Chemistry examination. This question covers Mole Concept .

Neco 2021 Chemistry Essay / Theory

Topic: Mole Concept

Question 4 NECO • 2021 • CHEMISTRY • essay

A 1.80 g sample of an unknown compound containing only carbon, hydrogen and oxygen is completely combusted. The combustion yields 4.44 g of carbon dioxide and 1.80 g of water. The molar mass of the compound is known to be 144 g mol⁻¹. A hydrate of this compound loses 0.45 g of water when 1.80 g of the hydrate is heated to a constant mass.

( a )

Determine the empirical formula of the compound from the combustion data.

( b )

Using the empirical formula and the given molar mass, calculate the molecular formula of the compound.

( c )

From the heating data of the hydrate, determine the number of water molecules of crystallisation per formula unit of the compound.

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This is Neco 2021 Chemistry Question 4. It is one of the essay questions from the 2021 Neco Chemistry examination.

The question covers Mole Concept .

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