Calculations involving masses.

• What is the formula for mass?

  Mass = moles * MR

  
• What is the formula for mass/mole in volume?

  Mass = concentration * volume

  Mass can also be moles.

  
• What is the formula for volume in terms of gasses?

  Volume = moles * 24

  This formula is for gasses only.
• What is Mr?

  The top number of the element in the periodic table.
• What is the empirical formula for glucose (C6H12O6)?

  CH2O.
• Devise an experiment used to find out empirical formulas:


  1. Get a clean crucible.
  2. Add a certain amount of magnesium ribbon to the crucible.
  3. Heat the crucible so that the oxygen reacts with the magnesium.
  4. weight the mass of the magnesium oxide and find the change in mass.
• What is meant by empirical formula?

  The simplest ratio of elements in a compound.
• What is meant by the molecular formula?

  The molecular formula represents the actual number of atoms in a molecule.