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A sample of .6820 g of an unknown compound containing barium ions (Ba+2) is dissolved in water and treated with an excess of Na2SO4. if the mass of the BaSO4 precipitate formed is0.4835 g, what is the percent by mass of Ba in the original unknown compound?
Show that the ratio of the surface area to the volume of the sphere is smaller than that for a cube of equal volume
What concentration of Ca2+ must be added to 0.010 M oxalate (C2O^-2 4) to precipitate 99.0% of the oxalate.
The acid-catalyzed addition of alcohols to alkenes occurs via a mechanism analogous to acid-catalyzed alkene hydration. The reaction occurs in 3 steps
Enough of a monoprotic acid is dissolved in water to produce a 1.54 M solution. The pH of the resulting solution is 2.95. Calculate the Ka for the acid.
Consider the titration of a 22.0 -mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. Determine each of the following. A. The initial pH B. the volume of added base required to reach the equivalence point in mL
A chemist at a pharmaceutical company is measuring equilibrium constants for reactions in which drug candidate molecules bind to a protein involved in cancer. Calculate the Kc value for the A-protein binding reaction.
If you used a concentration of 0.0065 M sodium thiosulfate instead of 0.0050 M sodium thiosulfate called for in reaction 1, what effects would this have, if any, on the rate of the reaction
a boy wants to prepare a 250ml of a buffer that is ph4.50. beginning with 100ml of 0.12 moll ch3cooh and a supply of
An aqueous solution of NaCl has a mole fraction of 0.30. What is the mass of NaCl dissolved in 185.9 mL of solution
What is the net redox reaction that occurs when Ag comes into contact with acidic K2Cr2O7? Which metal is the most reactive?
find the number of representative particles in each given substance 1 3.00 mol sn2 0.400 mol kcl3 7.50 mol so24 4.80 x
what is the wavelength emitted due to an electron moving from an infinitely far orbit (n=infinity) to n=2? in what region of the electromagnetic spectrum is this wavelength
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