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An unknown sample of Cu2+ gave an absorbance of 0.292 in an atomic absorption analysis. Then 2.00 mL of solution containing 100.0 ppm (= µg/mL) Cu2+ was mixed with 95.0 mL of unknown, and the mixture was diluted to 100.0 mL in a volumetric flask. The absorbance of the new solution was 0.462.(a) Denoting the initial, unknown concentration as [Cu2+]i, write an expression for the final concentration, [Cu2+]f, after dilution. Units of concentration are ppm.WebAssign will check your answer for the correct number of significant figures. [Cu2+]i
(b) In a similar manner, write the final concentration of added standard Cu2+, designated as [S]f .WebAssign will check your answer for the correct number of significant figures. ppm
(c) Find [Cu2+]i in the unknown.WebAssign will check your answer for the correct number of significant figures. ppm
if the mass of the tablet analyzed from the previous question was 1.247 grams what is the mass effectiveness of the
H2(g) + F2(g) 2HF(g) H = -542 kJ How many grams of H2(g) would have to react to produce 197 kJ of energy?
the specific heat of lead is 0.03 cals/J* degree C. If all the heat given up by the lead is used to melt the ice, how much ice is melted when the temperature drops to 0 degrees Celsius?
Determine how much oxygen in grams is formed by the complete reaction of 38.88 of Na2O2.
10 g of compound A is dissolved in 250 mL of water. A single extraction with 200 mL of ether was performed, after which the aqueous layer contained 2 g of A. Calculate the partition coefficient.
cylinders of compressed gas are typically filled to a pressure of 200 bar. for oxygen, what would be the molar volume at this pressure and 25 degrees Celsius based on the van der waals equation
Find the partial pressure and concentration of Nitrogen, Oxygen, and Carbon dioxide.
as molecules move up fractional distillation column they condense and then revaporize. durring which of these steps is
Bovine Serum Albunim (BSA) You need to make 100 ml of 2mg/ml BSA. Describe how you would dilute the stock solution to make this
let's pretend a certain sterling silver ring has a mass of 31.25g. silver has 93%. determine the mass of silver found in the ring.
Using the values for the heat of fusion, specific heat of water, and or heat vaporization, calculate the amount of heat energy in each of the following
Why will the extraction of benzoic acid by NaHCO3 generate a greater pressure of gas in the separatory funnel than the extraction
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