Moles

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Author:
gpiney
ID:
236790
Filename:
Moles
Updated:
2013-09-24 15:50:42
Tags:
Moles Weighted mean mass moles gas triangle
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Description:
Stuff to learn about moles
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  1. How many atoms are in a mole?
    6x1023 
  2. How many atoms in half a mole?
    3x1023
  3. How do you work out the number of moles of an element?
    • no. of moles = mass of element/ relative atomic mass of element
  4. How do you work out the mass of a mole or fraction of a mole of an element?
    mass=no. if moles x relative atomic mass
  5. How do you work out the number of moles in a compound?
    no. of moles = mass/relative molecular mass
  6. What is Avogadro's law ?
    At the same temperature and pressure equal volumes of all gases contain equal numbers of molecules.
  7. How do you work out the number of moles of a gas?
    no. of moles = number of dmat room temp./ 24

    OR

     = number of cmat room temp./ 24000
  8. What is the triangle used for working number of moles, concentration and volume?
  9. How do you calculate the weighted mean mass?
    • Isotope number x percentage (for all isotopes in calculation)
    • Divide by 100
    • Round to 1 d.p.
  10. What is another (easier) way of saying weighted mean mass?
    Relative atomic mass

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