The forensic technician at a crime scene has just prepared a luminol stock solut

Question

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. b) Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×102 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray? c)

Explanation / Answer

molar mass of luminol = 177.16g/mole

no of moles of luminol    = W/G.M.Wt

                                   = 11/177.6 = 0.06194moles

volume of solution        = 75ml = 0.075 L

Molarity of stock solution of luminol = no of moles/volume in L

                                                    = 0.06194/0.075 = 0.8258M

b. no of moles of luminol                = molarity *volume in L

                                                  = 4*10-2 *2

                                                   = 8*10-2 M = 0.08moles >>>> answer

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