The forensic technician at a crime scene has just prepared a luminol stock solution by adding 12.0g of luminol into a volume of 75.0mL of H2O. What is the molarity of the stock solution of luminol?
mols luminol = grams/molar mass = 12.0 g/177.2 = ?
Then M = moles/L = moles from above/ 0.0750= ?