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The absorptivity often used in rapid determinations of protein concentration is the E^1%, based on aromatic amino acid absorbance at 280nm in a 1 cm pathlength. The E^1% employed for a mixture of pr
A 0.0188 g sample of a non-electrolyte isolated from throat lozenges was dissolved in enough water to make 10.0 mL of solution at 25 degrees celsius. The osmotic pressure of the resulting solution w
The driving force for fluid flow is the pressure difference, and a pump operates by raising the pressure of a fluid (by converting the mechanical shaft work to flow energy). A gasoline pump is measu
A student weighs 0.12311 g of Na2CO3 and dissolves it in 50.0 mL of water in an Erlenmeyer flask. How many moles of HCl will be needed to reach the end point of titration?
The iron in a 1.0000g rock sample is dissolved, reduced to Fe+2 and titrated with dichromate. If the titration requires 12.40ml of 0.5000 Normal dichromate, what is the percentage of Fe2O3 in the s
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 500 mL of a solution that has a concentrat
A semiconductor laser in a CD player has an output wavelength of 780 nm and a power level of 0.10 mW. How many photons strike the CD surface during the playing of a CD 69 minutes in length?
The analysis of 4.017g of a strontium iodide hydrate revealed it contained 3.041g of anhydrous strontium iodide and thus 0.976g of water . Determine the formula of the hydrate.
Calculate the total pressure in the container at the conclusion of the reaction if the final temperature is 90oC. The equilibrium vapor pressure of water at 90°C is 526 mmHg.
Set up the Hamiltonian operator for the system of an electron interacting with a fixed nucleus of atomic number Z, such as singly ionized helium with Z=2.
Determine the molar concentration range of the iron(II)-bathophenanthroline complex that can be analyzed directly with a spectrophotometer, using a 1cm cuvette.
What kind of isomers are methylenemalonic acid and maleic acid: constitutional or geometric and would methylenemalonic acid yield a geometric isomer under the conditions of this experiment.
Why will fluorescein elute from an alumina-packed column when NaOH is added as a solvent? Why will methylene blue not elute using NaOH as a solvent?
What is the expected theoretical equivalence volume for the titration of 25.00mL of 0.1000 M HCl with 0.09755 M NaOH? Please show the chemical equation (including the chemical states) for the react
An adiabatic turbine expands steam from 500 degree celsius and 3.5 MPa to 200 degree celsius and 0.3 MPa. If the turbine generates 750 kW, what is the flow rate of steam through the turbine?
The rest of the tank contains steam in equilibrium with water. Spent process steam at 2 bar and 90 percent quality enters the storage tank until the pressure in the tank reaches 2 bar.
Exactly 350.00 ml of a soltuion containing 685.0 ppm Ba(NO3)2 were mixed with 310.00 mo of a solution that contained 0.0240 M Al2(SO4)3. What was the molarity of the unreacted reagent [Al2(SO4)3] or
Given the values below, discuss the interaction of the enzyme with both of these substrates and calculate the catalytic efficiency for hexokinase with each substrate if the concentration of hexokina
A sample of NO was composed of 5.2647 g of nitrogen and 6.0116 g of oxygen. How many grams of oxygen would there be in a sample of N2O4 that contained 7.0087 g of nitrogen.
A cylindrical vessel with rigid adiabatic walls is separated into 2 parts by a frictionless adiabatic piston. Each part contains 50.0 L of an ideal monatomic gas with Cv,m=3R/2.
Suppose your assignment were to prepare the Glaser type product of a mixed reaction of phenyl acetylene and propyne. How might the procedure in this experiment be modified so that the mixed product
A pentapeptide is composed of Ala, Cys, Lys, Phe, and Ser. NH2-terminal analysis of the peptide revealed PTH-serine. Trypsin digestion produces a dipeptide and a tripeptide. The tripeptide has an NH
A polypeptide is subject to the following degradative techniques resulting in polypeptide fragments with the indicated amino acid sequences.
Consider the compound sodium chloride. In the solid form is apperars white in color. However, when heated, it produces a yellow flame.. Explain what causes the difference in the appearance of the so
The density of aluminum is 2.70 g/cm3. A piece of foil that is 10.00 cm on each side has a mass of 440. mg. How thick is the piece of foil?