Mole Baggie Lab

Purpose and Summary  
        The purpose of this lab was for students to practice identifying substances using limited information. In this particular lab, the mass, number of moles, and number of particles were given. From this lab, students can also understand the concepts of moles and the relationships between moles and molar mass.
        Each group was given a bag, either from Set A or Set B, that held an unknown substance. After the group identified the substance, they had to solve a bag from the different set. The bags also had information for clues: Bag A had the mass of the empty bag and the number of moles, and Bag B had the mass of the empty bag and the number of particles listed.

Answers
        A6 is Sodium Chloride.
        B6 is Zinc Oxide.

Determining the Identity
        My partner and I first recieved the bag B6 from Set B. We started off by first weighing the bag, then subtracting the mass of the empty bag. Then, we converted the number of particles contained in the bag to the moles by using the conversion factor of 1 mol/6.02 x 10^23. Finally, we divided the number of particles in the sample by the number of moles in the sample to get the molar mass. We then matched our answer to one of the masses of the choices in the "Possible Compounds" list, and got Zinc Oxide.
        Next, for Set A, we recieved the bag A6. Again, we first weighed the bag and subtracted the mass of the empty bag to get the mass of the substance. Since we were already given the number of moles, we went straight to calculating the molar mass by dividing the number of particles in the sample by the number of moles in the sample, and then matched the molar mass to one of the masses of the choices in the "Possible Compounds". Our mass was ended up being closest to the mass of Sodium Chloride.

My calculations and work

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