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28 February, 08:14

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 gg of luminol into a total volume of 75.0 mLmL of H2OH2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units.

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  1. 28 February, 12:13
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    1.13 M

    Explanation:

    Given data

    Mass of luminol (solute) : 15.0 g Volume of solution = volume of water = 75.0 mL = 0.0750 L Molar 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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