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Chemical formulae, equations and calculations

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Question 2

Hydrofluorocarbons (HFCs) are widely used in modern refrigeration and air-conditioning systems as replacements for older ozone-depleting substances, though many are being phased down due to their high global warming potential. One such hydrofluorocarbon has the following composition by mass:

  • Carbon: 23.5%23.5\%23.5%
  • Hydrogen: 2.0%2.0\%2.0%
  • Fluorine: 74.5%74.5\%74.5%
a.

Calculate the empirical formula of this compound. [Relative atomic masses: C=12.0\text{C} = 12.0C=12.0, H=1.0\text{H} = 1.0H=1.0, F=19.0\text{F} = 19.0F=19.0]

[3]
b.

The relative formula mass (MrM_rMr​) of this compound is 102. State its molecular formula.

[3]

Chemical formulae, equations and calculations Questions

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