$$$6 \quad \mathbf{P}, \mathbf{Q}$$$ and $$$\mathbf{R}$$$ are three different hydrocarbon molecules. Define empirical formula. (ii) Hydrocarbon $$$\mathbf{P}$$$ contains $$$85.7 \%$$$ by mass of carbon. Calculate the empirical formula of $$$\mathbf{P}$$$. Show your working. empirical formula of $$$\mathbf{P}=$$$ (iii) Molecules of $$$\mathbf{P}$$$ have straight chains. Name the homologous series to which $$$\mathbf{P}$$$ belongs.

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s25_qp_24 Year：2025 Question No：IGCSE&ALevelChemistry2025AS0253

Answer:

Knowledge points:

13.1.1 define the term hydrocarbon as a compound made up of C and H atoms only

13.1.2 understand that alkanes are simple hydrocarbons with no functional group

13.1.3 understand that the compounds in the table on page 26 and 27 contain a functional group which dictates their physical and chemical properties

13.1.4 interpret and use the general, structural, displayed and skeletal formulae of the classes of compound stated in the table on page 26 and 27

13.1.5 understand and use systematic nomenclature of simple aliphatic organic molecules with functional groups detailed in the table on page 26 and 27, up to six carbon atoms (six plus six for esters, straight chains only for esters and nitriles)

13.1.6 deduce the molecular and/or empirical formula of a compound, given its structural, displayed or skeletal formula

2.3.1.1 the prediction of ionic charge from the position of an element in the Periodic Table

2.3.1.2 recall of the names and formulae for the following ions:

2.3.2 write and construct equations (which should be balanced), including ionic equations (which should not include spectator ions)

2.3.3 use appropriate state symbols in equations

2.3.4 define and use the terms empirical and molecular formula

2.3.5 understand and use the terms anhydrous, hydrated and water of crystallisation calculate empirical and molecular formulae, using given data

Answer:

Knowledge points:

Solution:

Related Question