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 of how many atoms of an element are present
  • The simplest whole number ratio of atoms of each element present in a compound
  • The formula telling you exactly how many elements are there
  • The simplest form of the composition of elements in a compound
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2. Calculate the atom economy for this reaction

  • 84.2%
  • 72.7%

3. 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

  • 109
  • 92
  • 34
  • 69

4. The molar mass/gmol-1 of strontium hydroxide, Sr(OH)2, is

  • 47
  • 122
  • 56
  • 105

5. The formula of aluminium chloride is

  • Al2Cl3
  • AlCl3
  • Al3Cl2
  • AlCl
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