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.

1355.37

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%) = ??
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http://en.wikipedia.org/wiki/Vitamin_B12

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To calculate the molar mass of cyanocobalamin, we need to determine the molar mass of each element present in the molecule and then sum them up.

Let's break down the formula of cyanocobalamin, which is C63H88CoN14O14P:

1. Carbon (C) has an atomic mass of 12.01 g/mol. In cyanocobalamin, there are 63 carbon atoms, so the total mass contribution from carbon is 63 * 12.01 g/mol.

2. Hydrogen (H) has an atomic mass of 1.01 g/mol. There are 88 hydrogen atoms in cyanocobalamin, so the total mass contribution from hydrogen is 88 * 1.01 g/mol.

3. Cobalt (Co) has an atomic mass of 58.93 g/mol. Since cyanocobalamin contains one atom of cobalt in each molecule, the total mass contribution from cobalt is 58.93 g/mol.

4. Nitrogen (N) has an atomic mass of 14.01 g/mol. Cyanocobalamin has 14 nitrogen atoms, so the total mass contribution from nitrogen is 14 * 14.01 g/mol.

5. Oxygen (O) has an atomic mass of 16.00 g/mol. There are 14 oxygen atoms in cyanocobalamin, which gives a total mass contribution of 14 * 16.00 g/mol.

6. Phosphorus (P) has an atomic mass of 30.97 g/mol. Cyanocobalamin contains one phosphorus atom, so the total mass contribution from phosphorus is 30.97 g/mol.

To determine the molar mass of cyanocobalamin, add up the mass contributions from each element:

Molar mass of cyanocobalamin = (mass of carbon) + (mass of hydrogen) + (mass of cobalt) + (mass of nitrogen) + (mass of oxygen) + (mass of phosphorus)

Plug in the values we calculated or obtained from periodic table for each element, and perform the calculation.

Once you have the molar mass of cyanocobalamin, you can use it to calculate other properties or relate it to other chemical reactions or equations.

molmass=atomicmassCo/.0434