A spherical fat cell has a diameter of 2.47 micrometers. The fat cell contains t

Question

A spherical fat cell has a diameter of 2.47 micrometers. The fat cell contains three copies of the protein azurin. What is the molar concentration of azurin within the fat cell?

the answer is either:
7.89 x 10-12 M
6.32 x 10-10 M
4.98 x 10-24 M
7.89 x 10-15 M
1.24 x 10-6 M

Explanation / Answer

6.32 x 10-10 M ------>M = Mol of Protein / Liters Liters mean the volume of the cell with units in L ------>Mol = 3/avogadros number = 4.98339E-24 3 proteins is kind of like 3 atoms and then you use avogadros number to convert from atoms to mols -----> L = Volume of the cell = (4/3)*pi*(r^2) where r = (2.47 E-6)/2 ----->L = 7.89023E-18 m^3 = 7.89E-15 L ----->M = Mol / L = (4.98339E-24 / 7.89E-15) = 6.32E-10

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