1.

Calculate the value of Avogadro number (N_(0)) from following data : (i) "Density of" NaCl = 2.165 gm cm^(-3) (ii) Distance between Na^(+) & Cl^(-) in NaCl = 281 pm.

Answer»

Solution :`rho = 2.165 g//cc`
`a = 281 XX 2 "pm"= 526 "pm"`
`= 5.62 xx 10^(-8)` cm
Z= 4(FCC)
`N_(0)= ?`
M = 23 + 35.5 = 58.5 a.m.u.
`rho = (Z xx M)/(N_(0)a^(3))`
`N_(0)=(Z xx M)/(rho.a^(3))`
`= (4 xx 58.5)/(2.165 xx ( 5.62 xx 10^(-8))^(3))`
`= (4 xx 58.5 xx 10^(24))/(2.165 xx ( 5.62)^(3))`
`N_(0) =6.02 xx 10 ^(23)`


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