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CHM1 15Example4 Collection

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Oct 18, 2019, 1:17:50 AM
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Oct 18, 2019, 1:17:50 AM
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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

/attachments/19e09755-f145-11e9-8682-bc764e2038f2/473ae612935105ff94c21c10ec870d7d.png

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

/attachments/19e09755-f145-11e9-8682-bc764e2038f2/c809cdbca763c07cfbf54d1d475e3fda.png

/attachments/19e09755-f145-11e9-8682-bc764e2038f2/b81e89831a3059a08bad7ef66ab613c0.png

= 308.0 mg

Note that the molar mass of C6H8O6

/attachments/19e09755-f145-11e9-8682-bc764e2038f2/feed58b501eb04acc5512373bf5cd11a.png

/attachments/19e09755-f145-11e9-8682-bc764e2038f2/d0befdc90aa4839df81f1362f6bd7bfb.png

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

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