Moles

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Author:
Anonymous
ID:
300146
Filename:
Moles
Updated:
2015-04-07 07:53:33
Tags:
Chemistry
Folders:
AS Chemistry Unit 1
Description:
AS Chemistry
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  1. What is a mole and its units? ( 2 marks)
    • The mole is the amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon-12.
    • mol
  2. What is one mole? ( 2 marks)
    • Avogadro Constant
    • 6.02 X 1023  particles
  3. What are the formula to find moles? (4 marks)
    • moles= mass (g) ÷ molar mass (g mol-1 )
    • moles= concentration/molarity(mol dm-3)×volume (dm-3 
    • moles= number of particles/atoms present/ no. in 1 mole
    • moles= volume(dm-3 ) ÷ 24
  4. What is the molar mass?
    The average mass of a molecule on a scale where an atom of carbon 12 is 12
  5. What the rule between moles and gases?
    One mole of any gas occupies 24 dm3 at 298 K and 1 atm
  6. What is the empirical formula?
    The smallest whole number ratio of atoms in a compound
  7. What is the molecular formula?
    The actual number of atoms in a molecule
  8. Equation for part per million?
    Concentration = (mass of component ÷ mass of solution) × 1 000 000 ppm
  9. Equation for percentage yield?
    Percentage yield = (Actual yield ÷ theoretical yield) × 100
  10. Equation for atom economy?
    Atom economy= (molecular mass of desired product ÷ sum of molcular massess of all the products) × 100

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