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Iron (II) ions catalyze the oxidation of luminal. The intensity of the resulting chemiluminescence has been shown to increase linearly with iron(II) concentration from 10-10 to 10-8 M. Exactly 1.00 ml of water was added to a 2.00 ml aliquot of an unknown Fe(II) solution, followed by 2.00 ml of a dilute H2O2 solution and 1.00 ml of an alkaline solution of luminol. The chemiluminescent signal from the mixture was integrated over a 10.0 s period and found to be 16.1. To a second 2.00 ml aliquot of the sample was added 1.00 ml of a 5.15 x 10-5 M Fe(II) solution followed by the same volume of H2O2 and luminol. The integrated intensity was 29.6. Calculate the Fe(II) molarity of the sample.
Subsequent to blanking with the pure solvent the absorbance of the solution is 0.543. Explain what is the concentration of the solution in the cuvette
A toxic, binary, gaseous oxide is 63.65% nitrogen by mass. determine its empirical formula.
Write net Bronsted equations and determine the equilibrium constants for the acid-base reactions that occur when aqueous solutions of the following are mixed.
How many milligrams of silicon tetraflouride, a gas, at room temperature, would fill the same volume as that occupied by 375 grams of carbon monoxide at 190*C and 500 Torr
Calculate the percent yield of salicylic acid (from 1.00 mmol isolated) from 7.00 g of Ben-Gay ointment. Ben-Gay ointment is 16% menthol
A 60.0-W incandescent light-bulb produces about 4.00% of its energy as visible light. Assuming that the light has an average wavelength of 510.0 nm, calculate how many such photons are emitted per second by a 60.0-W incandescent lightbulb
A rock contains 0.42 mg of Pb-206 and 0.53 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U-->206Pb is 4.5x10^9 yr.
draw the chair form of rings a-c of cholesterol and assign the hydrogens at the bc ring-junction as equatorial or
A certain protein was found to contain 0.412% manganese by mass. Determine the minimum molecular mass of the protein.
The equlibrium constant (Kc) for the following reaction is 6.7 *10^-10 at 630 C N2(s)+O2(g)>2NO (g). What is the equlibrium constant for (Kc) the reaction 1/2 N2(g)+1/2O2(g)>NO(g)
Considering resonance, arrange the following molecules and ions in order of increasing SO bond order.
Question- The lindlar catalyst is used to stop the hydrogenation of an alkyne at the alkene product. What would be the product of this reaction when the alkyne is 3-heptyne. Write the equation and show the stereochemistry of the product.
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