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An aqueous CaCl2 solution has a vapor pressure of 83.0 mmHg at 50 degrees celsius. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass perce
When Dr. Farrell was a graduate student, he once made up a pH 8.0 sodium acetate buffer. Why would the casual observer to this buffering faux pas come tot eh conclusion that he had the intellectual
You require a buffer with pH of 4.50. You have 1.00L of a solution of 1.80M acetic acid. How many grams of solid sodium acetate (NaC2H3O2, molar mass 82.0g/mol) must be added to give the pH of 4.50?
Assume you completely hydrolyze a sample of the peptide Phe-Val-Lys-Ser using the appropriate protease in a phosphate buffer solution at pH=7. What two species would actually constitute the phosphat
The Mn is clearly reduced and is the oxiding agent; how do you decide whether the H or the Fe is being oxidized? They both lose electrons.
A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 525 mL of a solution that has a concen
By titration it is found that 27.5 mL of 0.155 M NaOH (aq) are required to neutralize 25.0 mL of HCl (aq). Calculate the concentration of the hydrochloric acid solution.
Compute the theoretical yield of the product (in moles) for each initial amount of reactants.
Estimate the effective nuclear charge for an n=1 n=2 n=3 electron in sulfur. show steps.
Calculate the initial velocity of a reaction if the substrate concentration is 4 times the Km, show calculations.
Assuming that the combustion of palmitic acid gives off 10126.9 kJ/mol what is the maximum number of ATP molecules that can be generated from ADP and Pi, by combusting one palmitic acid molecule?
Calculate the initial velocity of a reaction in terms of V max if the substrate concentration is 1/2 the Km. Show the calculations.
List at least four themes by which enzymes interact with substrate to lower the transition state energy.
What is the empirical formula of a compound that has three times as many hydrogen atoms as carbon atoms, but only half as many oxygen atoms as carbon atoms?
The alcohol content of hard liquor is normally given in terms of the "proof," which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcoho
What would you expect to happen if you combined 1o.0mL of10mL of 10^-2 M acetic acid qand 5.0 mL of10^-2 M sodium hydroxide? What would be the concentrations of acetic acid and sodium acetate in thi
What is w per mole for a reversible isothermal expansion of an ethane from 5-10 L/mol at 298k assuming ethane is an ideal gas and it follows the Van der Waals equation?
How many mL of 4.50 M sodium hydroxide must be added to 250 mL of a 0.200 M acetic acid solution to make a buffer with pH = 5.00?
What is the boiling point of radiator fluid that is 50% antifreeze by mass? Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula.
What is the freezing point of radiator fluid that is 50% antifreeze by mass? K_f for water is 1.86 C/m. Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula C2H6O2.
Write the balanced redox half-cells and final equation for the reaction occurring in the titration.
Tris (pentaflourophenyl)borane, commonly known as BARF, is a polymerization initiator used in the manufacture of plastics. It is composed entirely of C, F, and B; it is 42.23% C by mass and 55.66% F
The density of this solution is 1.08 g/mL. Calculate the molarity, molality, weight percent, and mile fraction of the glucose solution.
Name 4 properties of a compound that is directly influenced by the polarity of the compond. And state the 2 most important factors that affect the polarity of a compound.
Given that the molar mass of H3PO4 is 97.994 grams, determine the number of H3PO4 needed to prepare 0.25 L of a 0.2M H3PO4 solution. What volume, in Litera, of a 0.2M H3PO4 solution can be prepared by