Stoichiometry

1
Stoichiometry

• pg. 81

2
Mole to mass

• start with given
• use mole to mole conversions to get to moles
• use molar mass to convert to mass
• Determine the mass of sodium chloride produced
  when 1.25 moles of chlorine gas reacts with
  sodium.

3
Mass to mass

• used when we are carrying out a reaction in the
  lab
• start with given
• use molar mass to convert to moles
• use mole to mole ratio to convert to moles of the
  other substance
• use molar mass to get the mass of the new
  substance
• Ammonium nitrate (NH4NO3), an important
  fertilizer, produces N2O gas and H2O when it
  decomposes. Determine the mass of water produced
  from the decomposition of 25.0 g of solid
  ammonium nitrate.

4
Practice

• If you begin with 1.25 mole of TiO2, what mass of
  Cl2 is needed?
• TiO2 C 2Cl2 ? TiCl4 CO2
• One in a series of reactions that inflate air
  bags in automobiles is the decomposition of
  sodium azide . Determine the mass of N2 produced
  if 100.0 g NaN3 is decomposed.
• 2NaN3 ? 2Na 3 N2