Q)
(chatquestion)...Example 18 : Calculate the value of Avogadro's number from the given data if density of NaCl = 2.165 g/cm?
Distance between Na* and CF in NaCl = 281 pm and MNaci = 58.5 g/mol.
fce.
+r) or a = 2 x distance between nearest neighbours
For NaCl structure, a = 2(
Solution:
2/2r
a = 2 x 281 = 562 pm% = 562 x 10-10 cm
Zx M
No x a
Zx M
No
pxa
4x 58.5
No
2.165 x (562x 1010)
On calculation Avogadro's Number = 6.02 x 1023 mol-1
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