Term 3-11ASP.LO 5.1+ 6.1 by Ranaz Omar https://padlet.com/rov10751/9h817mp5p0dboi4s en-us 2025-04-17 07:41:30 UTC 2025-05-22 05:25:33 UTC hello@padlet.com rov10751 https://padlet.com/rov10751/9h817mp5p0dboi4s/wish/3413714328 When the chemical reaction above is carried out under certain conditions, the rate of disappearance of D is 2.5 x 10^-2 Ms^-1. What is the rate of disappearance of E and the rate of appearance of F under these same conditions?

]]> 2025-04-17 07:45:01 UTC https://padlet.com/rov10751/9h817mp5p0dboi4s/wish/3413714328 Q2. Beer's Law https://padlet.com/rov10751/9h817mp5p0dboi4s/wish/3419098464 To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co*] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown above.


A 0.389 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 25.00 mL. Assume that all the cobalt in the ore sample is converted to Co^2+(aq) .

  • What is the [Co^2+] in the solution if the absorbance of a sample of the solution is 0.45?

  • Calculate the number of moles of Co^2+(aq) in the 25.00 mL
    solution.

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