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The distribution co-efficient, k = conc. In ligroin ÷ conc. in water, between ligroin and water for solute A is 7.5. What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100mL of ligroin? What weight of A would be removed by four successive extractions with 25-mL portions of ligroin? How much ligroin would be required to remove 98.5% of A in a single extraction?
Describe the average weight gain of an infant during the first year of life. How do the size and proportions of an infant's body change during the first 2 years? Child psychology and this question is based on the book, "Developing Person Thru Childh..
The U.S. is in recession and, at last report, GDP was shrinking at a rate of 1% per year. The unemployment rate is rising and now stands at 7%. In recent months, the rate of inflation has been holding steady and is increasing at an annual rate ..
Do you love Classic Disney? Do you ov Pixar and DreamWorks digital animation? Do you love one type more than another? Why? What stands out about one that the other can't capture?
A 68.0 mL solution of 0.500 M Cd(NO3)2 is prepared. What mass of NaOH is needed to precipitate the Cd2+ ions from this solution?
As part of your answer explain what happens when aggregate expenditure either exceeds or falls short of output in the current period and what impact this has on production in the next period.
If 1.00 g of Ca2+ dissolved in 420 mL of water reacts stoichiometrically according to the balanced equation in a reaction solution with a total volume of 1680 mL, what is the molarity (M) of Na+ produced?
Excel 2010 provides the capability to exchange data with other applications. Discuss the different types of ways to exchange data between Excel and other Microsoft applications.
This basic one costs $4,000 for the employee this year, plus $2,500 for the spouse, and $2,500 for any number of children. It also has a family deductible amount of $2,000 before benefits (80% paid; 20% co-insurance) kick in.
Calculate the mass of Nitrogen at room temperature dissolved at room temperature in an 80 L aquarium. Assume a total pressure of 1 atm and .78 mole fraction.
If a 1000 kilogram sample of rock is 0.021% gold by mass, how much zinc is needed to react with the gold extracted from the rock? Assume that the reaction is 100% efficient.
What is the change in air temperature(, assuming the heat from the steam is all absorbed by air)
Calculate the mole fraction of the salt in the solution
Calculate the percent water: mass of water lost / mass of hydrated salt x 100%. E. Write the empirical formula for hydrated alum, based on your experiment.
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. You quickly add 26.50 mL of 0.0502 M NaOH but overshoot the end point, and the solution turns deep pink.
A turbine operates adiabatically with super-heated steam entering at T1, and P1, with a mass flow-rate, m(dot). The exhaust pressure is P2 and the turbine efficiency is gamma
The molar enthapy of fusion for water is 6.008 kJ/mol. calculate the molar enthapy of vaporization of a substance if 0.652 mol of the substance absorbes 6.411 kJ when it melts.
A weather balloon has a volume of 450 L when filled with helium at 45oC to a pressure 0.80 atm. What is the new volume of the balloon in an atmosphere where the pressure
It takes 46.0 to raise the temperature of an 11.2 piece of unknown metal from 13.0 to 25.0. What is the specific heat for the metal?
why would the chemiluminscence be more pronounced than with the flask stoppered? why is the chemiluminscence even more pronounced with the ferriccyanide/hydrogen peroxide mixture?
How many moles of oxygen are consumed in burning 1.60 moles of benzene, C6H6?
Draw Line structures of each compound a.Benzyl alcohol, benzaldehyde, benzyl acetate b.Aniline,N,N-dimethylaniline, naphthalene c.Benzophenone, Biphenyl, Benzoic acid.
Suppose y was measured five times and average of these five measurements was 3.75. What is the uncertainty in x based on these five measurements?
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