Relative Formula Mass

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  • Created by: Brooke
  • Created on: 15-07-13 13:39
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  • Relative Formula Mass (RFM)
    • Calculating RFM
      • To calculate the RFM, all you have to do is add up the RAM of of all the atoms present in the formula
        • Most candidates do not have a problem calculating RFM until they meet an example involving water of crystallisation
    • The Mole
      • The mole is a measure of the AMOUNT OF SUBSTANCE
      • One mole (1 mol) is the amount of substance that contains 6x10 to the 23 particles (atoms, molecules or formulae) of the substance
        • 6x10 to the 23 is known as AVOGADRO NUMBER
        • For example, 1 mol of Sodium (Na) contains 6x10 to the 23 ATOMS of sodium
      • Calculating the mass of one mole
        • The mass of one mole of atoms is easily calculated. It is simply RAM expressed in grams
          • The mass of one mole is also easily calculated by working out the formula mass and expressing it in grams
    • Simple Calculations with moles
      • 1. CALCULATING MASS FROM NO. OF MOLES
        • Mass of substance (in grams) = amount of moles x RFM
      • 2. CALCULATING AMOUNT FROM MASS
        • Amount in moles = mass/RFM
      • 3.CALCULATIONS WITH ATOMS OF ELEMENTS
        • These types of calculations are important when working out the empirical formula of compounds
    • Molar volume of a gas
      • One mole of any gas has a volume of 24dm cubed (24000cm cubed) at room temp. This is called the molar volume of a gas
      • 1. CALCULATING VOLUME OF GAS FROM AMOUNT OF GAS
      • 2. CALCULATING AMOUNT OF GAS FROM THE VOLUME OF GAS

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