CHEM 1033 Chapter Notes - Chapter 2: Parallelepiped, Carbon-12, Intensive And Extensive Properties
25 Jul 2017
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Avogadro"s (cid:374)u(cid:373)(cid:271)er (cid:894)na(cid:895) is defi(cid:374)ed as the (cid:374)u(cid:373)(cid:271)er of ato(cid:373)s i(cid:374) e(cid:454)a(cid:272)tl(cid:455) (cid:1005)(cid:1006) g of pure (cid:272)ar(cid:271)o(cid:374)-12 isotope. This value is commonly referred to as a mole. A mole is simply a collective term, like a dozen (12), that is used to simplify calculations involving the very large numbers of atoms and molecules that occur on the macroscopic scale. The value of avogadro"s (cid:374)u(cid:373)(cid:271)er is (cid:1010). (cid:1004)(cid:1006)(cid:1006)(cid:1005)(cid:1007)(cid:1010)(cid:1011) (cid:454) Consistent with its definition as an amount unit, 1 mole of any element contains the same number of atoms as 1 mole of any other element. The masses of 1 mole of different elements, however, are different, since the masses of the individual atoms are drastically different. A unit cell is the smallest parallelepiped that can be drawn using the cu atoms in a three- dimensional crystal that still retains the essential symmetry of that crystal. Copper crystallizes in a face-centered cubic unit cell, as shown in figure 1.
