2.1.2 Compounds, Formulae, Equations and 2.1.3 Amounts of substance

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1. Define the term empirical formula

  • The formula telling you exactly how many elements are there
  • The formula of how many atoms of an element are present
  • The simplest whole number ratio of atoms of each element present in a compound
  • The simplest form of the composition of elements in a compound
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2. 0.129g of CH4 fills a 200cm^3 container at 25degrees and 100KPa. Calculate Mr of methane

  • 16g
  • 1.04g

3. Calculate the volume of CO2 produced from 10000 tonnes of Fe2O3 [1 tonne = 10^6g]

  • 1.504 x 10^12
  • 1.504dm^3

4. When 7.95g of copper(II) oxide, CuO, was reacted with excess sulfuric acid and the resulting solution filtered and allowed to crystalise, 23.0g of hydrated CuSO4.5H2O were produced. The percentage yield is

  • 69
  • 34
  • 92
  • 109

5. Calculate the atom economy for this reaction

  • 84.2%
  • 72.7%

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