10) Iron has three stable isotopes: 55Fe, 56FE, and 57Fe. The masses and natural abundance of each isotope are listed below. Isotope Isotopic Mass (amu) Natural Abundance (%) 55Fe 54.99 1.79 56FE 55.99 60.30 57Fe 56.99 a. What is the natural abundance of 57Fe? b. What is the atomic mass of iron? You might get a different answer than what is listed on the periodic table. c. If a sample of iron contains 0.582 kg, how many atoms are present? Use the atomic mass you calculated in part (b).

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.