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When performing extractions it is often better to do multiple extractions rather than one large volume extraction. suppose you have 100mg of a sample dissolved in 0.6ml of water. the partition coefficient or kp for this compound in water and diethyl ether is 4.0
a. calculate how much total compound you would obtain with 3 x 0.2ml extractions with ether
b. calculate how much you would obtain with 1 x 0.6ml extraction
c. which method is more efficient?
The maximum # of stereoisomers that are possible for a given molecule can be determined from the formula, 2^n, where n is the nubmer of stereocenters in the molecule.
MgNH4PO4 6H2O loses H20 stepwise as it is heated. Between 40c and 60c the monohydrate is formed and above 100c the anhydrous material is formed. What are the phosphorus percentages of the monohydrate and of the anhydrous material?
When the electrons return to the ground state, they lose the excess energy in the form of 640 nm photons. What is the energy gap between the ground state and excited state in the laser material? answer is in J i was absent in class and my test is ..
A given PH meter can be read with a standard deviation of +- PH units throughout the range 2 to 12 calculate the standard deviation of [H3O+] at each end of this range
Calculate the average O-F bond energy given the following average bond energies: O=O 498 kJ/mol F-F 159 kJ/mol
What would you expect the measured decay rate to be 4.00 hours later? The half-life of Ru-97 is 2.79 days.
0.1278- sample that is 97.50% As2O3 by mass had been used in the titration, how many milliliters of the 0.02140M KMnO4(aq) would have been required?
Calculate the concentration of cadium chloride contaminant in the original groundwater sample. Round your answer to 2 important digits.
Draw a formula for the lowest molecular weight compound that contains C, H, and possibly O, is a chiral compound, contains ONLY one functional group, and is a(n) carboxylic ester. Alkene or alkyne groups are considered as functional groups.
The work function for metallic rubidium is 2.09eV. Calculate the kinetic energy and the speed of electrons ejected by light with wavelength of (a) 650 nmand (b) 195nm.
How many thermodynamic degrees of freedom are available to an equilibrium system consisting of an ice cube floating in a glass of water
Calculate the final temperature of 32 mL of ethanol initially at 11 degrees C upon absorption of 562 J of heat.
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