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Chemistry
 Online Tutoring : Forum : Homework Help - Physical Sciences : Chemistry
Topic Topic: Chemistry II Post ReplyNew Question
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Asdfjkl
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Joined: 28 September 2007
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Posted: 28 September 2007 at 5:51am | IP Logged Quote Asdfjkl

If you have 100mg of Citric Acid in a can of soft drink, how many molecules of the citric acid do you have? How many O atoms are contained in 100mg of citric acid?



   
   
   
   
               
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Hardyabdullah
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Posted: 28 September 2007 at 9:54pm | IP Logged Quote Hardyabdullah

      Citric Acid  - chemical formula

                C6 H8 O7

Carbon =12 x  6 = 72   +  H = 1 x  8 =8   +   O  =  16  x  7 = 112 


RAM =  72 + 8 + 112 = 192

M = 100/192 = 0.52083333333333333333333333333333 M


a.)
0.52083333333333333333333333333333 x 6.03 x 10^23

= 3.140625 x 10^23   molecules

b.)
= 3.140625 x 10^23   molecules / 21 x 7

= 1.046875 x 10^23   oxygen atoms





 

C6H8O7


Edited by Hardyabdullah on 28 September 2007 at 10:45pm


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