# Question #80545

Oct 2, 2016

The atomic mass of cobalt $= 59 \text{ g/mol}$

It is given that Cyanocobalamin (vitamin B12) is commonly found in vitamin supplements. It contains 4.34% cobalt by mass and there is one atom of cobalt in every molecule of cyanocobalamin

So the mass of Cyanocobalamin which contains 1 g atom or 59 g Cobalt represents its molar mas.

So molar mass of Cyanocobalamin

$= \frac{100}{4.34} \times 59 \text{ g/mol}$

$\approx 1359.44 \text{ g/mol}$