1. A branch of chemistry dealing with the relationships of elements in compounds & mass relationships between products & reactants

2.  Schichion – element  Metron – to measure  Required information: balanced equation

3.  Composition – balancing a formula  Reaction – balancing equations  Reactants to products

4.  Mole-mole  Moles A  moles B  Mole-mass  Moles A  moles B  mass B  Mass-mole  Mass A  moles A  moles B  Mass-mass  Mass A  moles A  moles B  mass B

5.  Conversion factors that relates the moles of any 2 substances in a chemical reaction  Moles are like currency  Molar mass – mass in 1 mole of a substance

6.  2Ca + O 2  2CaO  Mg + 2HF  MgF 2 + H 2

7.  Equation – help us to make predictions  Form mole ratios  Limitations of equations – doesn’t tell how fast the reaction occurs  Ideal conditions – usually STP: at what conditions the most products are produced

8.  Moles of A  moles of B  Mole ratio conversion factor is needed  Moles of A * mole ratio B = moles B A  CO 2 + LiOH  Li 2 CO 3 + H 2 O  Is it balanced?  What is the mole ratio?

9.  CO 2 + 2LiOH  Li 2 CO 3 + H 2 O  Mole ratio 1:2:1:1  How many moles of LiOH are required to react with 20 mol CO 2 ?  Start with what you know  Mole ratio of LiOH/CO 2

10.  H 2 + O 2  H 2 O  With 5 moles of water, how many moles of H 2 would you need?  Step 1 – balance the equation  Step 2 – what do you know  Step 3 – mole ratio of hydrogen:water

11.  Units: mol or gram  Conversion factors: mole ratio & molar mass  Moles A  moles B  mass B  Moles A * Mole ratio B * molar mass B = A 1 mol B

12.  Photosynthesis  CO 2 + H 2 O  C 6 H 12 O 6 + O 2  What mass of glucose is produced from 24.0 moles of water?  Step 1 – balance  Step 2 – mole ratio glucose:water  Step 3 – molar mass of glucose

13.  Mass A  moles A  moles B  Mass A * 1 mol A * mole ratio B = MM A A

14.  If 8.00 g SO 2 reacts with C, how many moles of CS 2 are formed? C + SO 2  CS 2 + CO Is it balanced?

15.  Mass A  moles A  moles B  mass B  Mass A * 1 mol A * mole ratio B * MM B = MM A A 1 mol B

16.  Sn + HF  SnF 2 + H 2 How many grams of tin fluoride are produced from the reaction of 15.00g HF with Sn?