Question

1) Vitamin B₁₂, cyanocobalamin, is essential for human nutrition.  
Its molecular formula is C₆₃H₈₈CoN₁₄O₁₄P. A lack of this vitamin in the diet can lead to anemia. Cyanocobalamin is the form of the vitamin found in vitamin supplements.

What is the mass of 1.0 × 10¹⁰ molecules of cyanocobalamin?
g

2)

Dimethylnitrosamine (CH₃)₂N₂O is a carcinogenic (cancer causing) substance that may be formed in foods, beverages or gastric juices from the reaction of nitrate ion (used as a food preservative) with other substances.

How many atoms of hydrogen are in 1.0 mol of dimethylnitrosamine?
atoms of hydrogen

3)

Quinine, C₂₀H₂₄N₂O₂ is the bitter tasting compound in tonic water. It is also the compound used to prevent malaria.

What is the mass of 0.35 mol quinine?
g

Answer 1