; Percent Composition Using Molar Mass
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Percent Composition Using Molar Mass

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									                             Percent Composition Using Molar Mass
You can only receive credit if you have the math to support your answers.

1. Determine the percent composition of water, H2O. (2 pts)




2. What is the percentage of carbon in methane, CH4? (2 pts)




3. What is the percentage of carbon in ethane, C2H6? (2 pts)




4. What is the percentage of carbon in propane, C3H8? (2 pts)




SWBAT Translate information into a table, graph, or diagram
5. Based on your answers from questions 3-5, please draw a graph of a general trend of how the percentage of
carbon changes as you add more carbon atoms to a compound. Make sure to have your axes properly labeled with
the independent and dependent variables. (6 pts)




SWBAT Predict the results of an additional trial or measurement in an experiment
6. Based on the trends you saw in question 5, predict what the percentage of carbon will be in butane, C4H10? You
shouldn’t need to use any math, make a prediction! (6 pts)
Percent Composition of Metals in Minerals
Show the setups for all calculations.

1.     a. What percentage of the mineral hematite, Fe2O3, is iron? (1 pts)




       b. Write this percentage as a fraction out of 100 grams of mineral. (1 pts)



       c. If we have 16 g of the mineral hematite in 100g of ore. What is the percent of the mineral in the ore?(1 pt)



       d. Find the mass in grams of Fe in 100g of the ore mentioned above. (1 pts)



2.     a. What percentage of the mineral magnetite, Fe3O4, is iron? (1 pts)




       b. Write this percentage as a fraction out of 100 grams of mineral. (1 pts)



       c. If we have 34 g of the magnetite, Fe3O4, in 100g ore. What is the percent of the mineral in the ore? (1 pts)



       d. Find the mass in grams of Fe in 100g of the ore mentioned above. (1 pts)



SWBAT Determine which models are supported or weakened by new information
3. You are a geologist working for Shell Oil Company, and someone brings you a sample of a mineral they found in
their backyard. You run some analyses, and you determine the mineral is made up of 141.32 grams of iron and
59.97 grams of oxygen. Based on these measurements, what type of mineral is this? Be sure to back your
conclusions up with data. (7 pts)

								
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