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29 November, 17:14

Pepsi brand soft drinks contain 38 mg of caffeine (molar mass = 194.19 g/mol) for every serving (355 mL of solution) What is the molarity of caffeine in this solution?

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  1. 29 November, 18:03
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    Molarity is 5.51 * 10^-5 mol/dm3

    Explanation:

    Molarity shows the number of solutes in moles per litre of solution.

    step 1: Calculate the concentration in g/dm3

    38 mg in 355 mL of solution

    38 / 1000 g in 355/1000 L of solution

    Concentration in g/dm3 = 0.0038 / 0.355

    = 0.0107 g/dm3

    step 2: Calculate the concentration in mol/dm3

    Concentration in mol/dm3 = concentration in g/dm3 / RMM

    RMM = 194.19 g/mol

    Molarity = 0.0107 / 194.19

    molarity = 5.51 * 10^-5 mol/dm3 of solution.
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