CHM 1045
Fall 1999
Dr. Michael Blaber

Name_________________________SS #__________________________

Homework #3

(Due in Recitation Tues Sep 21)

 

  1. Write the balanced chemical equation for the combustion of pentanol. (C5H12O). (1/2 point)

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  2. Potassium reacts with Chlorine to produce the ionic solid potassium chloride (KCl). Which elements would you predict would react with Bromine in a similar type of reaction? (1/2 point)

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  3. What is the formula weight of Sucrose (C12H22O11)? What is the percentage by mass of C, H and O in Sucrose? (1 point)

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  4. How many grams are there in 3.80 moles of Lithium Oxide? (1/2 point) How many moles are there in 100g of Aluminum Sulfide? (1/2 point)

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  5. A certain carbohydrate compound (containing only C, H and 0) is 40.0% C, 6.72% H, and 53.3% O by mass. The experimentally determined molecular mass is 180 amu. What is the empirical and chemical formula for this carbohydrate? (2 points)

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  6. Ethanol has the chemical formula C2H5OH (or C2H6O) . If 25.0 grams of ethanol 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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  7. In the combustion of ethanol from the above example, how many grams of CO2 would be produced if 20 g of ethanol were combusted with 20 g of O2 ? Which is the limiting reagent? (2 points)

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  8. What is the molarity of a solution of LiOH made by dissolving 5.7 g of LiOH in 23.8 mls of H2O? (1/2 point)

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  9. You have a stock solution of 8.5 M NaOH and an unlimited amount of pure water. How would use these two to make a 0.5 liter solution of 0.5 molar NaOH? (1/2 point)