Question

CAN SOMEBODY HELP ME WITH THESE QUESTIONS FOR. YOUR HELP WILL BE MUCH APPRECIATED.

uestion 3 12 marks Cobalt(I) chloride is a coloured transition metal compound. The fo 0.150 M CoCl2(aq) when analysed using visible light. following is its absorption spectrum of Absorption spectrum of cobalt) chloride 0.8 0.7 0.6 0.5 20.4 B 0.3 0.2 0.1 100 200 300 400 500 600 700 wavelength(nm) (a) (i) Explain why 425 nm is suitable to be used as wavelength of analysis (ii) Calculate the energy, in kJ per mole, for photon with the wavelength of 425 nm [1+3 marks] (b) A series of standard solutions were prepared and absorbance values were measured at 425 nm. One of the diluted solution with 0.0120 moT L-1 had an absorbance value of 0.681 Calculate the molar absorptivity value, &, of cobalt() chloride at 425 nm. Specify the unit.

Answer 1