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CGB IGCSE Chemistry
Practice problems - the mole
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Practice Problems

The Mole

 

  1. What is the mass, in g, of:
    1. 1 mole of boron atoms
    2. 1 mole of nickel atoms
    3. 3 moles of cobalt atoms
    4. 2.5 moles of scandium atoms
    5. 0.1 moles of fluorine atoms
    6. 0.5 moles of argon atoms
    7. 0.4 moles of silicon atoms
    8. 0.3 moles of iodine atoms
    9. 1.7 moles of krypton atoms

 

  1. What is the mass, in g, of :
    1. 1 mole of fluorine molecules, F2
    2. 4 moles of fluorine molecules, F2
    3. 0.5 moles of bromine molecules, Br2
    4. 1.2 moles of bromine molecules, Br2
    5. 3 moles of oxygen molecules, O2

 

  1. Find how many moles of atoms there are, in:
    1. 14 g of Lithium
    2. 3 g of hydrogen
    3. 24 g of iron
    4. 400 g of cobalt
    5. 256 g of nickel
    6. 2.5 g of helium
    7. 74 g of phosphorus
    8. 12.7 g of boron
    9. 16 g of carbon
    10. 902 g of gold
    11. 34 g of silver
    12. 5 g of arsenic

 

  1. For each pair, decide which of the two substances contains the greater number of atoms.  Remember, there are 6.02 x 1023 atoms per mole.
    1. 12 g of sodium or 12 g of magnesium
    2. 14 g of calcium or 14 g of potassium
    3. 26 g of aluminum or 58 g of bromine
    4. 67 g of antimony or 15 g of selenium
    5. 1 mole of chromium or 1 mole of cobalt
    6. 2 moles of oxygen atoms or mole of oxygen molecules (O2)

 

  1. What is the mass, in g, of:
    1. 1 mole of sulphuric acid, H2SO4
    2. 2 moles of magnesium oxide, MgO
    3. 1.5 moles of sodium chloride, NaCl
    4. 10 moles of lithium fluoride, LiF
    5. 0.2 moles of ethane, C2H4

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