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ch11_avognum_uc_calc

ch11_avognum_uc_calc - 2 atoms = x x x-mol mol 0.534...

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Calculate Avogadro’s Number, N A Li metal is bcc with an edge length of 3.509 D and a density of 0.534 g/cm 3 . Calculate Avogadro’s Number, N A . (AW: 6.941) (1 D = 1 x 10 ! 8 cm) You want N A : atoms/mol Start with something on the right-hand side that has one of these units in the correct place. There’s two things you could start with, g/mol or atoms/uc. R = 3.509 D = 3.509 x 10 ! 8 cm V = R 3 = (3.509 x 10 ! 8 ) 3 cm 3 /uc bcc ==> 2 atoms/uc atoms 6.941 g 1 cm 3 1 uc
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Unformatted text preview: 2 atoms ? --------- = ----------- x ---------- x -------------------------- x -----------mol mol 0.534 g (3.509 x 10 ! 8 ) 3 cm 3 uc = 6.0 1 673 x 10 23 atoms/mol = 6.02 x 10 23 atoms/mol or atoms 2 atoms 1 uc 1 cm 3 6.941 g ? --------- = ----------- x ------------------------- x ----------- x -----------mol uc (3.509 x 10 ! 8 ) 3 cm 3 0.534 g mol = 6.0 1 673 x 10 23 atoms/mol = 6.02 x 10 23 atoms/mol...
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