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Pepsin is the principal digestive enzyme of gastric juice. A 3.00g sample of pepsin is dissolved in enough water to make 10.0 mL of solution. The osmotic pressure of the solution is found to be 0.213 atm. What is the molecular weight of pepsin?
This mixture has density of 1.391g/L and occupies a volume four times as that of pure hydrocarbon. Determine the molecular formula of the hydrocarbon.
Calculate the vapor pressure of water above a solution prepared by dissolving 35.0 of glycerin () in 135 of water at 343 . (The vapor pressure of water at 343 is 233.7.)
Write a structural and a line-angle formula of propene (C3H6). Write the IUPAC name. On the structure, specify a shape of each carbon
solution is needed to just neutralize excess acid after 20 mL of HCl was added to 1. g of the antacid, how many moles of acid can the antacid counteract per gram.
Compound A, C14H10, absorbed only 2 equivalents of H2 on catalytic hydrogenation over a Pd/C catalyst to yield compound B, C14H14. On ozonolysis, compound A gave only benzoic acid, C7H6O2. Draw the structure of compound B.
The peak was assigned as a Mn-Cl stretching mode of a contaminate manganese chloride species. Why would you expect this to be an erroneous assignment? Suggest a more likely source of this IR absorption.
the compounds shown are possible acylation products from 124-trimethylbenzene pseudocumene. explain the only way you
A 750-mL sample of nitrogen was collected by displacement of water from a container at 30°C and an atmospheric pressure of 742 Torr. If the vapor pressure of water at 30°C is 31.8 Torr, calculate the number of moles of nitrogen gas produced.
A student mixed 50.0 mL of 0.50 M H2SO4 (aq) at 18.5 degrees C with 100 mL of 0.50 M NaOH (aq) at the same temperature. After the reaction was completed, the temperature rose to 22.0 degrees C. What was the heat of reaction? (Assuming the densitie..
Forty miles above the earth's surface, the temperature is 250 K and the pressure is 0.12 mm Hg. What is the density of air at that altitude. Assume the molar mass of air is 28.95 g/mol
A 1.4639g sample of limestone was analyzed for Fe, Ca, and Mg. The iron was determined as Fe2O3, yielding 0.0357g. Calcium was isolated as CaSO4, yielding a precipitate of 1.4058g, and Mg was isolated as 0.0672g of Mg2P2O7.
from the IR, 1H NMR spectrum and uv values decide what functional groups are present in the compound and deduce any other structural information you can, such as existance of conjugation in the carbonyl compound.
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