Avogadros number can be computed from the following measured properties of pure

Chapter 3, Problem 3-22

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Avogadros number can be computed from the following measured properties of pure crystalline silicon:4 (1) atomic mass (obtained from the mass and abundance of each isotope), (2) density of the crystal, (3) size of the unit cell (the smallest repeating unit in the crystal), and (4) number of atoms in the unit cell. For silicon, the mass is mSi 28.085 384 2 (35) g/mol, where 35 is the uncertainty (standard deviation) in the last two digits. The density is 2.329 031 9 (18) g/cm3 , the size of the cubic unit cell is c0 5.431 020 36 (33) 108 cm, and there are 8 atoms per unit cell. Avogadros number is computed from the equation From the measured properties and their uncertainties, compute Avogadros number and its uncertainty. To find the uncertainty of , use the function y x a in Table 3-1. 3-2