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A mixture containing 80.0 nM iodoacetone (designated A) and 64.0 nM p-dichlorobenzene (designated B) gave the relative detector response (peak area of A)/(peak area of B) = 0.71 in a chromatography experiment. A solution containing an unknown quantity of A plus 930 nM B gave a relative detector response (peak area of A)/(peak area of B) =1.21. Find the concentration of A in the unknown.
for a particular redox reaction MnO2 is oxidized to MnO4- and Ag+ is reduced to Ag write a balanced equation
How many grams of zinc are there in 22.7 g of ZnCl2?
A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 487-mg sample of the barium compound if a solution of the s..
What mass of CCl2F2 substance must evaporate in order to freeze 135 g of water initially at 15 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
Derive Eh-pH equations based on the progressive oxidation of Mn to form oxides starting with metallic Mn. b) Plot these equations in coordinates of Eh and pH
Calculate the concentration of Cu2+ ion in this standard solution if the stock solution was 0.0200 M Cu2+.
Two ideal gases are in a container but separated by an insulating barrier. The gases are both at a pressure of 2 atm but are at different temperatures and volumes.
What is the mole fraction of methane in the mixture? (Assume that the water produced by the combustion is in the gaseous state.)
use curved arrows to show the flow of electrons in each step, and note any relevant charges or lone pairs of electrons.
Describe spectroscopic or chemical tests to distinguish between the following pairs of compounds
The vapor pressure of a mixture of 400 g of carbon tetrachloride and 43.3 g of an unknown compound is 137 torr at 30 °C. The vapor pressure of pure carbon tetrachloride at 30 ºC is 143 torr
Li2S is pictured n the text on .553. The length of the unit cel i 5.88 x 10^2 pm. For this structure determine: the coordination numbers of Li + and S2-
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