Vitamin , 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.

CoX₂, so there is 1 mol of cobalt for 1 mol of the compound. The molar mass of the cobalt is 59 g/mol. So, there is 59 g of cobalt in 1 mol of the cyanocobalamin and it represents 4.34% of the total mass, so:

0.0434m = 59

m = 1359.45 g of cyanocobalamin

The molar mass of the molecule is the mass divided by the number of moles (which is 1), so it is:

M = 1359.45 g/mol = 1360.0 g/mol

adefioyelaoye adefioyelaoye · Answer 2 · 2022-02-03T13:35:15+01:00

The molar mass of cyanocobalamin is 1360.0 g/mol

We were told that there is one atom of cobalt in every molecule

of cyanocobalamin which means the formula will be depicted as

CoX₂.

Molar mass of cobalt = 59 g/mol.

59 g of cobalt in 1 mol of the cyanocobalamin represents

4.34% of the total mass

Number of mole= mass/molar mass

Molar mass= mass/number of mole

0.0434 × mm = 59

mm= 59/ 0.0434

mm = 1359.45 g of cyanocobalamin

The molar mass is therefore 1360.0 g/mol

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