The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g of luminol into a total

3 answers
Question:

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 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.

Answers

The answer is in the photo


[tex]The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g[/tex]

1.13 M.

Explanation:

Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 L of the solution.

M = (no. of moles of luminol)/(Volume of the solution (L).

∵ no. of moles of luminol = (mass/molar mass) of luminol = (15.0 g)/(177.16 g/mol) = 0.085 mol.

Volume of the solution = 75.0 mL = 0.075 L.

∴ M = (no. of moles of luminol)/(Volume of the solution (L) = (0.085 mol)/(0.075 L) = 1.13 M.

1.13 M

Explanation:

Given data

Mass of luminol (solute): 15.0 gVolume of solution = volume of water = 75.0 mL = 0.0750 LMolar mass of luminol: 177.16 g/mol

The molarity of the stock solution of luminol is:

M = mass of solute / molar mass of solute × liters of solution

M = 15.0 g / 177.16 g/mol × 0.0750 L

M = 1.13 M

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