C3

• What is conserved in a chemical reaction?

  Total mass of all substances
• Why must we balance chemical equations?

  Atoms that go in must come out
• What do we add to find the relative formula mass of a compound?

  Add up the individual relative atomic masses
• What is the relative formula mass of CO2?

  44
• What happens when a gas product leaves the reaction vessel?

  It results in a decrease in mass
• What is a mole in chemistry?

  A specific number of atoms or molecules
• Why do we use moles in chemistry?

  To compare amounts of substances
• How many grams of a substance equal one mole?

  As many grams as its relative atomic mass
• What is the concentration of a solution in g per decim cubed?

  Mass of solute per volume of solution
• What does percentage yield indicate?

  Actual product made vs. theoretical product
• If you start with 20 g of reactants and end with 10 g of ammonia, what is the percentage yield?

  50%
• What does atom economy measure?

  Efficiency of mass in a reaction
• How do you calculate atom economy?

  (RAM of desired product / total RAM of reactants) × 100
• What is the volume occupied by one mole of any gas at RTP?

  24 decim cubed
• What are the conditions for RTP?

  20°C and one atmosphere pressure
• How do you convert moles to volume at RTP?

  Multiply or divide by 24