Summary: The purpose of this lab was to determine the substances in two Ziploc bags with only the mass of the empty bag, the substance's representative particles or the number of moles of the substance, a balance, and a calculator. The first bag given to us was bag B3. The first thing we did was find the molar mass of each of the possible compounds so we could compare them to our answers from our calculations. We then converted the representative particles to moles; this was done by dividing the R.P. by Avogadro's number. Next, weweighed the bag to get the mass of both the bag and the substance, and then subtracted the mass of the empty bag to get the mass of just the substance. Afterwards, we divided the result by the moles of the substance in the bag. We had to do this process twice because of a faulty balance that, on the first try, led us to an answer much less than the actual. Bag A4 was much easier; we used a correct balance this time, and again subtracted the mass of the empty bag from that. We first divided the result by the number of moles of the substance, the latter of which was given, and then compared it to our possible compounds.
Result: Bag B3 was Potassium Sulfate, and bag A4 was Calcium Carbonate.
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