amount of substance

Subdecks (2)

Cards (45)

  • Specific heat capacity, c
    The energy required to raise the temperature of 1 g of a substance by 1K.
  • Stoichiometry
    The ratio of the amount, in moles, of each substance in a chemical reaction.
  • Water of crystallisation
    Water molecules that are bonded into a crystalline structure of a compound.
  • Relative atomic mass, Ar
    The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.
  • Relative formula mass
    The weighted mean mass of the formula unit of a compound compared with one-twelfth of the mass of an atom of carbon-12.
  • Relative isotopic mass
    The mass of an isotope compared with one-twelfth of the mass of an atom of carbon-12.
  • Relative molecular mass, Mr
    The weighted mean mass of a molecule of a compound compared with one-twelfth of the mass of an atom of carbon-12.
  • Molar mass M
    The mass per mole of a substance, in units of g mol-1
  • Amount of substance, n

    The quantity whose unit is the mole. Chemists use amount of substance as a means of counting atoms
  • Atomic number Z
    The number of protons in the nucleus of an atom (also proton number)
  • Avogadro's hypothesis
    Equal volumes of gases at the same temperature and pressure contain the same number of molecules
  • One mole of carbon, C, atoms has a mass of 12 g
  • One mole of hydrogen, H, atoms has a mass of 1 g
  • One mole of magnesium, Mg atoms has a mass of 24.3 g
  • One mole of iron, Fe, atoms has a mass of 55.8 g
  • amount = n
  • mass = m
  • molar mass = M
  • n = m/M OR moles = mass/Mr