CHM1 15Example4 Collection

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Example 3

Click here to see the calculation on Video

Solution The known volume and concentration allow us to calculate the amount of NaOH(aq) which reacted with all the vitamin C. Using the stoichiometric ratio

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we can obtain the amount of C₆H₈O₆. The molar mass converts that amount to a mass which can be compared with the label. Schematically

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= 308.0 mg

Note that the molar mass of C₆H₈O₆

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can be expressed in milligrams per millimole as well as in grams per mole.