a forensic technician at a crime scene has just prepared a luminol stock solutio

Question

a forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solu a forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solu a forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solu

Explanation / Answer

Luminol formula: C8H7N3O2

Molarity = number of moles of luminol/volume of prepared solution

Number of moles = wt of luminol/mol wt of luminol

Mol wt = 177 g/mol , Given: wt = 19.0 g and volume = 75 ml = 0.075L

Moles = 19/177 = 0.1073 moles

Molarity = 0.1073*0.075 = 0.008M

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