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.
Answer to relevant QuestionsFungal laccase, a blue protein found in wood- rotting fungi, is 0.390% Cu by mass. If a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase? The element silver (Ag) has two naturally occurring isotopes: 109Ag and 107Ag with a mass of 106.905 amu. Silver consists of 51.82% 107Ag and has an average atomic mass of 107.868 amu. Calculate the mass of 109Ag. Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO2 and 6.45 mg H2O. If 0.250 mole ...Balance the following equations. a. Cr(s) + S8(s) ( Cr2S3(s) Heat b. NaHCO3(s) ( Na2CO3(s) + CO2(g) + H2O(g) Heat c. KClO3(s) ( KCl(s) + O2(g) d. Eu(s) + HF(g) ( EuF3(s) + H2(g) e. C6H6(l) + O2(g) ( CO2(g) + H2O(g) Phosphorus can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4) 2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + P4(s) + 10CO(g) Phosphorite is a mineral that contains Ca3(PO4)2 plus other non- phosphorus- ...
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