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1A. A 1.000g sample of steel is dissolved in acid and the manganese oxidized to permanganate. Water is added until the total volume of the solution is 250mL. The absorbance at 520nm is found to be 0.700. Claculate the percentage of manganese in the steel if the molar absorptivity of permanganate is 2235L/cm mol at this wavelength? The cell path length is 1.00cm.
B. A compound of molar mass 1.00E2 g/mol has a molar absorptivity of 3.0E5L/cm mol. How many grams of this compound should be dissolved in 1.00L so that in a 250 fold dilution the resulting solution will give an absorbance reading of 0.600? Assume the cell path to be 1.00cm.
Consider the titration of a 25.0 mL sample of 0.110M HC2H3O2 with 0.130M NaOH. Determine the pH at one-half of the equivalence point. initial pH=2.85, the volume of added base required to reach the equivalence point=21.2 mL
What is the maximum concentration of Cd2+ that can exist in a solution in which the S2- concentration is 2.5 x 10-6? Ksp(CdS) = 8.0 x 10-27
data below show equilibrium constant for this reaction meassured at several different temperature. use data to find dHrxn and dHSrxn for reaction
Consider an electrochemical cell constructed from the following half cells, linked by a KCl salt bridge. The nickel electrode loses mass and the nickel electrode is the cathode.
The value of Kc for this reaction is 5.0 at 600 K. What are the equillibrum partial pressures of the three gases if a reaction vassel initially contains a mixture of the reactants in which Pco=Pcl2=0.215 atm and Pcocl2= 0.000 atm?
Adding a concentrated solution of NH4OH(aq) caused the precipitation of Cr+2 and Fe+3 as insoluble hydroxides. The Cu+2 remained in solution and forms the complex ion Cu(NH3)4+2. Which balanced molecular equations represent each of these reactions
The order of skunks is caused by chemical compounds called thiols. These compounds, of which butanethiol(C4H10S) is a representative example, can be deodorized by reaction with household bleech (NaOCl) according to the following equition
450 L sample of a gaseous compound at 72.5 cm of hg pressure and at 1.00*10^2 has a mass of 1.86 g. what is the molecular weight of the compound
use 60 words or more. define mass and weight. what are the differences between them? some ideas for responses might
how many grams of carbon are required to react with 1.5x10^25 atoms of hydrogen to form CH4
what is the minimum amount of ammonium carbonate that is necessary to be placed in the flask in order for the system to come to equilibrium? please show work.
ideal gas in 2.0 L what will be the volume of the gas if the pressure on the container is doubled while the temperature is reduced from 400 K to 200 K.
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