Chemistry - Mols

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  • Moles
    • RFM = 1 mol (g) of substance
      • H = 1 mol
      • 2H = 2 mols
    • avogadro's constant = 6.02 x 10*23 = #atoms/ molecules/ ions in a mol of a substance
    • Mass (g) = Mr (g/mol) x Moles (mol)
      • mass of 1 mol of H2? Mr: 1 x 2 moles: 1 mol mass: 2 x 1
    • common to use excess of a reactant (usually acid) in reaction. reactant used up = limiting reactant
    • Conservation of mass: reactants mass = product mass
    • calculations
      • calculate mass: 1. calculate mols of __ with known mass. 2. use ratio to work out how many mols are needed for __ with unknown mass. 3. use worked out mols x Mr of __ with unknown mass to work out that mass
      • balance equations: 1. use conservation of mass to work out unknown mass. 2. use mass / Mr to work out mol for each __. 3. put into ratio (whole numbers) = ratio of reaction
      • Mols ratio = fixed value -Stoichiometry

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