Calculate the molar mass of cyanocobalamin, assuming that there are fourteen atoms of nitrogen in every molecule of cyanocobalamin.

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 14.47% nitrogen by mass. Calculate the molar mass of cyanocobalamin, assuming that there are fourteen atoms of nitrogen in every molecule of cyanocobalamin.

answer in g/mol format

Answer 1

14 N atoms x 14.01 amu/atom = 196.14 amu/molecule

196.14 g/x g = 14.47%/100%

14.47x = 19614

x = 19614/14.47 = 1355 g/mole = molar mass