RevieThe main reason that distillation is a costly method for purifying water is the high energy requiredto heat and vaporize water.Part AUsing the density, specific heat, and heat of vaporization of water from Appendix B in the textbook, calculate the amount of energy required to vaporize 1.00 gal of water beginning with water at 25 °C.Express your answer using two significant figures.E = 9700 kJSubmitPrevious AnswersCorrectThe volume of the water, given in gallons, must first be converted to grams using the density from the appendix.3780 gal x 4g xIL x 1000 mL1 gal * 1.057 qt0.99707 g H2O1 ml1.43 x 107 g H201LFirst, the water needs to be heated from 25 °C to 100 °C. The heat associated with this process is calculated using the specific heat of water from the appendix.9 = mcAT%3D1.43 x 107 g H,0 x 4.184 J x (100°C – 25°C) x 1 kJg.°Cx (100°C — 25°С) х1000 J4.481 x 10° kJOnce the water reaches 100 °C, it must then be vaporized. The heat associated with this process is then calculated using the heat of vaporization from the appendix.9 = 1.43 x 107 g H20 x1 mol H2018.02 g H20x 40.67 kJmol H20= 3.223 x 107 kJThe total amount of energy required is the sum of these two heat values.4.481 x 10° kJ + 3.223 x 10' kJ9700 kJ/gal Ha0energyPart BIf the energy is provided by electricity costing S0.087 /kwh, calculate its cost. (1 kwh= 3.6 x 10® J)Express your answer using two significant figures.$ 0.23SubmitPrevious Answersv CorrectThe cost is calculated using the conversion factors given.v $0.085* kwh9700 kJ x 1000 J x1 kwhgal H.0 X$0.23/galcostkJ X3.6x10° J Part BIf the energy is provided by electricity costing $0.087 /kwh, calculate its cost. (1 kwh = 3.6 x 10 J)Express your answer using two significant figures.$ 0.23SubmitPrevious AnswersCorrectThe cost is calculated using the conversion factors given.1000 J9700 k.Jgal H201 kwh3.6x10° J$0.085costkJkwh$0.23/galPart CIf distilled water sells in a grocery store for $1.19 per gal. what percentage of the sales price is represented by the cost of the energy?Express your answer using two significant figures.%SubmitRequest Answer

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Part C If distilled water sells in a grocery store for $1.19 per gal. what peroentage of the sales price is represented by the cost of the energy? Express your answer using two significant figures. ? %

Part C If distilled water sells in a grocery store for $1.19 per gal. what peroentage of the sales price is represented by the cost of the energy? Express your answer using two significant figures. ? %

Introductory Chemistry: A Foundation

8th Edition

ISBN:9781285199030

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter10: Energy

Section: Chapter Questions

Problem 84AP

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Similar questions

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General Zod has sold Lex Luthor what Zod claims to be a new copper-colored form of kryptonite, the only substance that can harm Superman. Lex, not believing in honor among thieves, decided to carry out some tests on the supposed kryptonite. From previous tests, Lex knew that kryptonite is a metal having a specific heat capacity of 0.082 J/gC and a density of 9.2 g/cm3. Lex Luthers first experiment was an attempt to find the specific heat capacity of kryptonite. He dropped a 10 g 3 g sample of the metal into a boiling water bath at a temperature of 100.0C 0.2C. He waited until the metal had reached the bath temperature and then quickly transferred it to I 00 g 3 g of water that was contained in a calorimeter at an initial temperature of 25.0C 0.2C. The final temperature of the metal and water was 25.2C. Based on these results, is it possible to distinguish between copper and kryptonite? Explain. When Lex found that his results from the first experiment were inconclusive, he decided to determine the density of the sample. He managed to steal a better balance and determined the mass of another portion of the purported kryptonite to be 4 g 1 g. He dropped this sample into water contained in a 25-mL graduated cylinder and found that it displaced a volume of 0.42 mL 0.02 mL. Is the metal copper or kryptonite? Explain. Lex was finally forced to determine the crystal structure of the metal General Zod had given him. He found that the cubic unit cell contained four atoms and had an edge length of 600. pm. Explain how this information enabled Lex to identify the metal as copper or kryptonite. Will Lex be going after Superman with the kryptonite or seeking revenge on General Zod? What improvements could he have made in his experimental techniques to avoid performing the crystal structure determination?
9.45 What happens to the temperature of a material as it undergoes an endothermic phase change? If heat is added, how can the temperature behave in this manner?
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