CHM 1045
Dr. Michael Blaber

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Homework # 4

  1. How many grams are there in 0.5 moles of Barium Chloride? (1/2 point)

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  2. How many moles are there in half an ounce of silver? (assume there are 28.8 grams per ounce) (1/2 point)

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  3. For the compound sodium hydroxide (NaOH) what is the percentage by mass for each element Na, O and H? (2 points)

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  4. A certain hydrocarbon compound (containing only C and H) is 83.6% C and 16.4% H by mass. The experimentally determined molecular mass is 86.2 amu. What is the empirical and chemical formula for this hydrocarbon? (2 points)

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  5. Hexane has the chemical formula C6H14 . If 5.8 grams of hexane is combusted to completion, producing only CO2 and H2O, how many grams each of CO2 and H2O are produced? (2 points)

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  6. In the combustion of hexane from the above example, how many grams of CO2 would be produced if 11.6 g of hexane were combusted with 30 g of O2 ? Which is the limiting reagent? (2 points)

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  7. What is the molarity of a solution of NaCl made by dissolving 12.3 g of NaCl in 130 mls of H2O? (1/2 point)

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  8. You have a stock solution of 5 M NaCl and an unlimited amount of pure water. How would use these two to make a 2.8 liter solution of 0.15 molar NaCl? (1/2 point)