Homework Help Forum: Chemistry

Posted by Chemistry on Sunday, September 13, 2009 at 9:25pm.

Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants. Although nutritional requirements for the vitamin are quite low, people who abstain completely from animal products may develop a deficiency anemia. Cyanocobalamin is the form used in vitamin supplements. It contains 4.34% cobalt by mass. Calculate the molar mass of cyanocobalamin, assuming that there is one atom of cobalt in every molecule of cyanocobalamin. I have no clue even where to start.

• Chemistry - bobpursley, Sunday, September 13, 2009 at 9:37pm

  molmass=atomicmassCo/.0434

  
  

• Chemistry - DrBob222, Sunday, September 13, 2009 at 9:40pm

  Let's see. If Co has a mass of 58.93 and that accounts for 4.34% of the total mass, then the molar mass of the compound must be 58.93 x (100%/4.34%) = ?? You can check this out at http://en.wikipedia.org/wiki/Vitamin_B12 Close!

  
  

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