Mole calculations for solids

• Solution


  A mixture formed whenever a substance dissolves in a liquid
• Solute


  The substance being dissolved
• Solvent


  The liquid doing the dissolving
• Concentration of a chemical solution

  The amount of solute dissolved in a certain volume of solvent
• Calculating concentration of a substance

  1. Number of moles

  2. Concentration

  3. Volume
• n = c x v
• Worked Example 1


  • Concentration of copper chloride solution with 2 moles dissolved in 500 cm³ of water
• Worked Example 2


  • Calculating moles of sodium hydroxide dissolved to make 100 cm³ of 2 mol/L solution
• Mole


  1 mole = Gram formula mass in grams
• Calculating gram formula mass


  Use relative atomic masses from data book
• Worked Example 3


  • Calculating gram formula mass of CaCO3
• Worked Example 4


  • Calculating gram formula mass of Al2(SO4)3
• Calculating number of moles from mass

  Number of moles = Mass / Gram formula mass
• Worked Example 5


  • Calculating mass of 0.2 moles of NaOH