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Hydrates & Gram Formula Mass. Hydrates:. Hydrate = a substance in which water is part of the crystal structure. Feels dry to the touch Water is “trapped” Naming = name of the compound + “prefix” hydrate AlCl 3 •6H 2 O K 2 SO 3 •2H 2 O Ni(OH) 2 •H 2 O. Naming Hydrates:.

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hydrates
Hydrates:
  • Hydrate = a substance in which water is part of the crystal structure.
      • Feels dry to the touch
      • Water is “trapped”
  • Naming = name of the compound + “prefix” hydrate
        • AlCl3•6H2O
        • K2SO3•2H2O
        • Ni(OH)2•H2O
naming hydrates
Naming Hydrates:
  • Naming = name of the compound + “prefix” hydrate
      • AlCl3•6H2O
      • K2SO3•2H2O
      • Ni(OH)2•H2O
gram formula mass
Gram Formula Mass
  • Gram Formula Mass (GFM) = the mass (in grams) of 1 mol of an ionic compound.
      • Molar mass of the ionic compound
  • GFM of GFM of Fe2O3?
    • How many Fe in each unit?
    • How many O in each unit?
    • 1 mole of Fe2O3 units =
  • GFM of (NH4)2S?
    • How many N?
    • How many H?
    • How many S?
    • 1 mole of (NH4)2S =
gram formula mass1
Gram Formula Mass
  • GFM of GFM of Fe2O3?
    • How many Fe in each unit?
    • How many O in each unit?
    • 1 mole of Fe2O3 units =
gram formula mass2
Gram Formula Mass
  • GFM of (NH4)2S?
    • How many N?
    • How many H?
    • How many S?
    • 1 mole of (NH4)2S =
gram formula mass3
Gram Formula Mass
  • What is the mass of 6.2 mol FeCl3?
  • How many moles are there in 4.54 g (NH4)2HPO4?