C3

• What is the Law of conservation of mass?

  No atoms are lost or made during a chemical reaction, so the mass of the products equals the mass of the reactants
• What is the Limiting reactant?

  The reactant that gets used up in a reaction
• How to work out the volume of a gas at room temperature?

  Volume = Number of moles x 24
• Why is it not possible to achieve 100% yield in a chemical reaction?

  1. Some of the product may be lost when it is separated from the reaction mixture
  2. The reaction may not go to completion because it is reversible
  3. Some of the reactants may react in different ways to the expected reaction
• What is the number of molecules in 1 mole?

  6.02 x 10^23
• Give two reasons why it is important to use a reaction with a high atom economy

  1. More sustainable
  2. Less waste