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1. Explain why an object whose color is purple actually absorbs visible light in the green wavelength region.
2. If the concentration of an unknown solution we were studying in a Beer's Law experiment were higher than the range of concentrations used to prepare the standard plot, suggest how we could determine its concentration. Suggest possible limitations.
3. A solution containing 0.010 moles of some copmlex ion in 100.0mL of solution was observed to transmit 65/0% of the incident light compared to an appropriate blank. a) what is the absorption of the solution at this wavelength? b) what fraction of light would be transmitted by a solution four times as concentrated?
4. A sample in a 1.0 cm cell is determined to transmit 80.0% of the light at a fixed wavelength. If the molar absorptivity of this substance at this wavelength is 2.3, what is the concentration of the substance?
5. a) what are the factors that could lead to deviations from Beer's law? b) Name at least three factors that could lead to experimental errors in the measurements made in this experiment.
How much heat (in kJ) is evolved in converting 1.00 {mol} of steam at 160.0C to ice at -45.0C? The heat capacity of steam is 2.01 J/g*C and of ice is 2.09 J/g*C.
A solution is prepared by dissolving 13.4 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 12.00 mL sample of this stock solution is added to 57.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions ..
Given the thermodynamic data in the data table below, calculate the equilibrium constant for the reaction: 2SO2 (g) + O2(g/0 2SO3(g), Substance Delta Hf (kj/mol) Delta S (J/K *mol)
a 1.00 g sample of an alloy of copper and aluminum was reacted with hydrochloric acid , and 85.0 mL of hydrogen gas (measured atSTP) was produced.
Compute the number of gms of CoCl2 that would be needed to prepare the solutions:(a) 550 mL of a 1.75 M solution (b) 210 mL of a 0.0180 M solution.
A sample of molten iron occupies a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
If an intravenous solution containing 123 mg of a drug substance in each 250-mL bottle is to be administered at the rate of 200mcg of drug per minute,how many milliliters of the solution
Why Do I Require More CaCO3 to Raise pH than Predicted? If you can remember back to a discussion and inquiry we exchanged last week concerning the use of sodium carbonate vs. calcium carbonate
When 25mL of a 120mL stock solution containing 2M AlCl3 is diluted to 80mL, how many moles of Al3+ are in the new solution.
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr ( Ksp= 5.0E-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.00L of 0.500M Na2S2O3?
Three isotopes of argon occur in nature - 36Ar, 38Ar, 40Ar. Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and the abundances of each of the isotopes: argon
After the vessel was pressurized with hydrogen gas and heated to 80 degrees C, the monometer showed the initial pressure inside the "bomb" to be 77.2 atm. Assuming 100% yield, calculate the pressure that should be inside the "bomb" when the reacti..
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