Question

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 6.54% hydrogen by mass. Calculate the molar mass of cyanocobalamin, assuming that there are eighty-eight atoms of hydrogen in every molecule of cyanocobalamin.

Answer 1

1356.33 g/mol

Step-by-step explanation:

Number of hydrogen in 1 molecule of cyanocobalamin = 88

Molar mass of hydrogen = 1.008 g/mol

So, Mass of hydrogen in one mole of cyanocobalamin = 88*1.008 = 88.704 g

Also, Given that mass of hydrogen is 6.54 % Of the mass of cyanocobalamin.

Thus,

`6.54\ \%=(Mass_(hydrogen))/(Mass_(cyanocobalamin))* 100`

So, Applying values, we get:

`0.0654=(88.704)/(Mass_(cyanocobalamin))`

Mass of 1 mole of cyanocobalamin = 1356.33 g

So, molar mass = 1356.33 g/mol