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At 25 degrees C, 1.0 gram of caffeine will dissolve in 47 ml of water, in 8.1 ml's of chloroform, in 86 ml of benzene, or in 370 of diethyl ether. Calculate the partition coefficient of caffeine between water and each of the other three solvents. Which of these three organic solvents would be the best choice for extracting caffeine from an aqueous solution?
Unknown compound A (C8H12) is reacted with H2 (excess) in the presence of a palladium catalyst forming compound B (C8H16). In addition when compound A is reacted with O3 followed by zinc and acetic acid the following two compounds are formed
a coal-burning power plant generates electrical power at a rate of 500 megawatts that is 500 x 10 to the 6th power pr
What are the oxidation number of the central atom of the following species. Please explain how to do this.
Calculate the number of photons emitted in one second by a 13 W laser operating at a wavelength of 400.0 nm. photons
1.given that nickelii perchlorate that is a polyatomic ion with the formula clo41- dissolving in water first of all
Combustion of a .2000g sample of vitamin C sample produced .2998 g of carbon dioxide and .0819 g of water. If this compound is composed of C, H, and O, then what is its empirical formula?
You have 10 mL of .2 M sodium acetate and 1 mL of .1 M HCl, and 9 mL distilled water. Divide the solution in half In one half, add .5 mL .1 M HCl, the other half, add .5 mL .1 M NaOH. Calculate the pH before the two additions and after.
Asumming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum ph
The volume of the base required to neutralize the acid was 47.14 mL. Aqueous silver nitrate was then added to precipitate the Cl- and Br- ions as AgCl and AgBr. The mass of silver halides obtained was 0.9974 g. What are the molarities of HCl and H..
What is the total sample size (in grams) for a sample of magensium nitrite which contains 0.96 g of oxygen
predict the products formed (if any) and write the balanced molecular equation, complete ionic equation and net ionic equation.
what is the approximate frequency of a photon having an energy 4.85 x 10-19 j? h 6.63 x 10-34
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