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Calorimetry Lab

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Our task was to identify the powder in each bag containing different amounts of moles. The mole provides a standard unit of measure that can be used to compare a wide variety of substances. A mole of atoms gives you a physical representation of what a single atom. The molar mass is the total mass of an element divided by one mole in that element. The molar mass can be used as a physical property to identify unknowns by converting it to moles and seeing which one is the closest to the moles in the bag. Our guiding question to answer was: “What are the identities of the unknown compounds?” Before we could begin our experiment, we had to create a procedure. First, we found the molar mass of each of the compounds the unknown bags could be. Then, we zeroed out the scale with the weight of the empty bag on it. Next, we weighed Bag A twice to make sure we got the correct amount. After weighing Bag A, we took the average of Trial 1 and Trial 2 and put all of the information in a data table. We repeated these steps for Bags B-G. Lastly, we converted the compound’s molar mass to…show more content…
To find the molar mass we took the average mass of bag divided by the bag’s moles which is the same formula as stated in my introduction. An example of this is for Bag D we did 7. 34 g divided by .0907 moles which equals 80. 93 grams per mole. After we got this answer, we looked at our calculations for each compound to see which one matched the closest. The molar mass for the compound Zinc (II) oxide was 81. 39 g. We assumed that Bag D had to be Zinc (II) oxide because the compound’s molar mass was very close to Bag D’s molar mass. We continued doing this method for every bag. Bag F’s molar mass did not match a compound’s molar mass after we had finished matching the others, so we classified it as
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