Grab binders, handouts & begin the Do Now
5/6 DO NOW
1. Determine whether or not the following reaction equations
obey the law of conservation of mass. BALANCE any reactions
that do not obey the law of conservation of mass.
a. H2O2  H2O + O2
b. Cu + 2Ag(NO3)  Cu(NO3)2 + 2Ag
c. Fe + Cl2  FeCl3
*Get out “Lab 3. Synthesizing & Testing the Purity of Aspirin”
2. Calculate the Molar Mass for the following compounds:
a. Iron (Fe)
b. FeBr2
c. H2O
The Mole & Molar Mass Notes
• What do the following all have in common?
The Mole & Molar Mass Notes
Which of the following doesn’t belong?
• Dozen
• Couple
• Few
• Baker’s Dozen
• Ten
The Mole & Molar Mass Notes
Key Point 1:
• Mole = a counting unit
• 1 mole = 6.02 x 1023 particles
• Tells us how many particles of a compound are
actually involved in a reaction
602,000,000,000,000,000,000,000 particles
Avogadro’s Number!
Key Point #2: Molar Mass
• Molar Mass = the mass of 1 mole of a substance
• Tells us what mass of a substance is used in a
reaction
• Units = grams per mole (g/mol)
Example: 1 mole of Magnesum= 24g
Molar Mass of Magnesium = 24g/mol
Steps to Calculate Molar Mass of
Compounds:
1) Count out the atoms in the
compound
2) Look up the Molar Mass for each
element
3) Multiply the Molar Mass of each
element by the # present in the
compound
4) Sum the Molar Masses
Calculate the Molar Mass of the following
1) NO2
2) SO2
3) C6H12O6
4) (NH4)3PO4
Calculate the Molar Mass of the following
1) NO2 = 46g/mol
2) SO2 = 64g/mol
3) C6H12O6 = 180g/mol
4) (NH4)3PO4 = 149g/mol
Lab 3: Synthesizing Aspirin
Question:
Are brand name commercial prescription drugs better
than generic or homemade prescription drugs?
Directions: 15 min…
- determine the WHAT part of your purpose
- Read the lab background and complete the
hypothesis and Pre-lab questions
- Begin drafting your introduction
Aspirin Lab
How do you compare bottled water to water
from EPIC’s water fountains?
How can we determine what’s good and what’s
bad?
Lab Question
Are brand name commercial prescription drugs
better than homemade prescription drugs?
Lab 3: Synthesizing Aspirin
Directions: 60 min…
- Complete the Lab
- Clean up your lab bench
- Begin your written lab report & complete
class work
Theoretical Yield
C7H6O3(s) + C4H6O3(aq)  C9H8O4(s) + C2H4O2(aq)
How much did we start with?
Molar Masses?
Mole Ratio?
Lets climb up & down the mole hill…
Percent Yield & Percent Error
Percent Yield: How much product you obtained
Percent yield = (actual yield ÷ theoretical yield) x 100%
Percent Error: How accurate you were
Percent error = | actual yield – theoretical yield | x 100 %
theoretical yield
Conclusion
Restate the purpose
Explain your hypothesis (accepted or rejected?)
Results – use your results to answer the
purpose!
Unknown – what were some unexpected errors
that occurred? If your percent yield
was not 100%, then why?
New – what can you change if you were to
perform this lab again?
Exit Ticket 4
Directions:
You have 5 minutes to complete the Exit Ticket
to the best of your ability. You MAY NOT use
notes, but you may use a Periodic Table. When
finished submit to the class bucket and put up
your binder.