The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol to \rm H_2O creating a solution with...

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol to rm H_2O creating a solution with a total volume of 75.0 rm mL. What is the molarity of the stock solution of luminol? What volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B)?