The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione... better known as luminol

Question

The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione... better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood.
Luminol has a molecular weight of 177g/mol

Part A-The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0g of luminol to H2O creating a solution with a total volume of 75.0 mL.
What is the molarity of the stock solution of luminol?
***The answer for part a is 0.753M

Part B- Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00

Explanation / Answer

Given, molarity=0.753 M

no of moles =0.12 mol

Thus, using the relation : Molarity x volume(in litre)= No. of moles

So, volume =0.12/0.753 =0.15936 litre

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