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A sample advertised as pure fructose obtained at a health food store, is analyzed as follows: a 22.5 gram sample is dissolved in 50.0 mL distilled water and the solution is allowed to slowly equilibrate for one hour. It is then placed in a 1dm tube in a polarimeter at 20 degree C. The observed rotation is -41.4 degrees. Calcultae the specific rotaion. Consult the following specific rotations for common carbohydrates and decide if the commericial sample is pure fructose.
Specific rotations: D-Ribose-23.7, L-Arabinose +104.5, D-Xylose +19.0, D-Glucose +52.2, D-Galactose +80.5, D-Mannose +14.6, D-fructone -92.0, D, L-rhamnose +8.9, L-sorbose -43.4, Lactose +55.3, maltose +136.0, sucrose +66.5, ralttinose +105.2, trehalose +178.3.
A blood-volume determination was carried out on a patient by injection with 20.0 mL of blood that had been radioactively labeled with Cr-51 to an activity of 4.10 microCi/mL.
After treatment with trypsin, which cleaves at R and K, there were 3 fragments: two dipeptides and MGAV. What is the sequence of the peptide? Use the one-letter abbreviations for the amino acids, and do not use dashes.
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include lone pairs of electrons and hydrogen atoms.
If solar radiation is 1200 W/m^2 , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 for solar radiation. A green leaf has a surface area of 2.15 cm^2.
Write a mechanism for the conversion of 1-butanol to 1-butyl bisulfate, indicating the flow of electrons.
Calculate the amount of heat needed to change 1.0 g ice at 0 degrees C to water vapor
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) In a certain experiment, 4.30 g of NH3 reacts with 7.48 g of O2. Which is the limiting reactant?
degree cl the initial concerntration of the three gases are 0.270M h2s,0.270 h2 and 0.135 s2. determine the equilibrium concentrations of the three gases
Estimate the vapor pressure at 45 degrees C using the Clausius-Clapeyron equation and the two given data points.
Calculate the change in its standard molar Gibbs free energy when benzene is heated from 25 ºC to 45 ºC.
A circular storage tank in the san Ardo california oil field water treatment facility is 50 yards in diameter. Estimate how many barrels of fluid this tank could hold
If the BaSO4 residue was baked in an oven at 100C for several hours rather than air drying, what effect would this have on its mass and how would the initial concentration of H2SO4 be affected
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