# 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/molThe 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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