Homework Help: 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

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