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2 April, 05:40

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 16.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol?

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  1. 2 April, 08:41
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    The molarity of the stock solution of luminol is 1.2 M

    calculation

    step 1: find the moles of luminol using (moles = mass/molar mass) formula

    molar mass of Luminol = 177 g/mol

    moles is therefore = 16.0 g / 177 g/mol=0.0904 moles

    Step 2: find the molarity using (molarity = moles/volume in liters) formula

    convert Ml into liters = 75.0/1000 = 0.075 L

    molarity is therefore = 0.0904 moles / 0.075 L = 1.2M
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