Sub-topic #3: Hydrated Compounds

• How many moles of water are in one mole of CuSO₄•5H₂O?

  5 moles of water
• How much does 5 moles of water weigh?

  90 grams of water
• What percentage of CuSO₄•5H₂O is water by weight?

  36% water by weight
• What are efflorescent compounds?


  They lose water spontaneously to the atmosphere when standing.
• What are hygroscopic substances?


  They absorb water from the atmosphere to become hydrates.
• What are deliquescent compounds?


  They absorb so much water from the atmosphere that they dissolve in their water of hydration.