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Edexcel IGCSE Chemistry 1.33 Formula Calculations Questions

Practise calculating empirical and molecular formulae from percentage composition, mass data and experimental results tables.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • divide percentage composition by Ar values, then simplify the mole ratio to an empirical formula
  • use heating or reduction data to calculate element masses before deriving an oxide formula
  • convert hydrated salt mass loss into moles of water and anhydrous salt to find x

Edexcel IGCSE Chemistry 1.33 Formula Calculations Questions question 1

[Maximum number: 5]

The table shows the structures of six organic compounds.

Table for Question Edexcel IGCSE Chemistry 1.33 Formula Calculations Questions question 1 — Edexcel IGCSE Chemistry

Question (a)

(a)

Another compound, G, has this percentage composition by mass.

C=37.8%H=6.3%Cl=55.9%\mathrm{C}=37.8 \% \quad \mathrm{H}=6.3 \% \quad \mathrm{Cl}=55.9 \%

Show by calculation that the empirical formula of compound G is C2H4Cl\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{Cl}

[ 3 ]

Question (b)

(b)

The relative formula mass ( MrM_{\mathrm{r}} ) of G is 127

Determine the molecular formula of G .

[ 2 ]
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