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Chemical formulae, equations and calculations

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Question 74

A sample of a chlorofluorocarbon (CFC) contains 0.24 g0.24\text{ g}0.24 g of carbon, 0.57 g0.57\text{ g}0.57 g of fluorine, and 0.355 g0.355\text{ g}0.355 g of chlorine.

a.

Show, by calculation, that the empirical formula of the CFC is C2F3Cl\text{C}_2\text{F}_3\text{Cl}C2​F3​Cl.

[2]
b.

The relative formula mass of the CFC is 233233233. Deduce the molecular formula of the CFC.

[2]
c.

The displayed formula of another CFC is:

F∣F−C−Cl∣F\begin{array}{ccccc} && \text{F} && \\ && | && \\ \text{F} &-& \text{C} &-& \text{Cl} \\ && | && \\ && \text{F} && \\ \end{array}F​−​F∣C∣F​−​Cl​

Draw a dot-and-cross diagram of this CFC. Show only the outer electrons.

[2]

Chemical formulae, equations and calculations Questions

  1. IGCSE
  2. /Chemistry
  3. /Chemical formulae, equations and calculations