bmb428_problemsete2

# bmb428_problemsete2 - BMB428 Physical Chemistry with...

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BMB428 Dr. Song Tan Physical Chemistry with Biological Applications Fall 2007 1 Extra Problem Set 2: Solutions, chemical equilibrium, ligand binding, bioenergetics Please note that this extra Problem Set includes more questions corresponding to material covered in Problem Sets 10-12 than for the material covered in Problem Sets 13-17. You should not think that the examination will be similarly skewed. (Questions 7 & 8 are good examples of a problem that uses concepts and formulas you should know in ways that you haven't encountered in class. I consider these sort of problems to be more challenging than simple "plug-and-chug" type of questions, but I also consider them to be good ways to develop or test your analytical skills.) 1. What is the molarity of an aqueous sulfuric acid solution containing 2.12 moles sulfuric acid per kg solution? The density of this solution is 1.30 g/ml. 2. (5.2 reworded) What is the molarity of a 2.12 molal aqueous sulfuric acid solution? The density of this solution is 1.30 g/ml. (please note how question1 is different from question 2) 3. (5.5 reworded ) Convert a 0.25 molal sucrose solution into percent by weight. The density of the solution is 1.2 g/ml and the molecular weight of sucrose is 342.30 g/mol 4. (part of 5.7) The blood sugar (glucose, MW = 180.16 g/mol) level of a diabetic patient is approximately 0.140 g of glucose/100 ml of blood. Calculate (a) the number of moles of glucose per ml of blood, (b) the number of moles of glucose and (c) the weight in grams of glucose in the patient assuming a total of 5 liters of blood in the patient's body. 5. (5.8 reworded) The strength of alcoholic beverages is usually descrbed in terms of "proof", which is defined as twice the percentage by volume of ethanol. (a) Calculate the number of grams of alcohol in 2 quarts of 75-proof gin. (b) What is the molality of the gin assuming that the ethanol/water mixture is an ideal solution (this is actually an extremely poor assumption, but we will make this assumption for simplicity here)? The density of ethanol is 0.80 g/ml and 1 quart = 0.946 liters.

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## This note was uploaded on 07/23/2008 for the course BMB 428 taught by Professor Tan during the Fall '07 term at Penn State.

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bmb428_problemsete2 - BMB428 Physical Chemistry with...

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