Lab: Mole Baggie Lab
This lab's purpose was to determine what substance was in a bag
given minimal information. The information given was either
"A": The mass of the bag and the number of moles of the substance in
the bag, or "B": The mass of the bag and the number of particles of
the substance in the bag. For my first go at this activity, I received
Bag A5 and the substance inside was Zinc Oxide, ZnO. After my first and
only attempt at Set A, I received Bag B3 and inside was Potassium Sulfate, K2SO4.
Once finding and calculating data, we were given five substances to
compare our results to.
Determining the substaces was not too difficult. For Set A,
I massed the bag and the substance (4.71 g) and subtracted the mass of the bag
itself (2.56 g). Then I used the mass of the substance (2.15 g) and
divided that by the number of moles in the given sample. The final
conclusion for Set A was that the substance had a molar mass of 86 g and this
value was closest with Zinc oxide having a molar mass of 81.39 g. For Set
B, I massed the bag and the substance (5.99) and subtracted the mass of the bag
itself(2.55 g). Then, I converted the amount of particles of the
substance (1.20 x 10^22) to the amount of moles in the bag (0.020 moles).
Then, we took the amount of grams of the sample (3.44 g) and divided it
by the amount of moles of the sample (0.020 moles) and found that the substance
had a molar mass of 172 g. This was closest to Potassium sulfate having a
molar mass of 174.3 g.
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| Sample of Potassium Sulfate |
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