Question

Calculate the value of Avogadro number from the following data:
density of NaCl= 2.165 g/cm 3,distance between Na + and Cl - in NaCl=281 pm

Answer 1

Calculate the value of Avogadro's number from the following data: Density of NaCl = 2.165 g c m − 3 Distance between N a + and C I − in NaCl = 281 pm.

Answer 2

Hey dear,

● Answer -
NA = 6.089×10^23 molecules/mol

● Explaination -
# Given -
bond length = 281×10^-10 cm
Z = 4
M = 58.5
d = 2.165

# Solution -
Side length of unit cell is given by -
a = 2 × bond length
a = 2 × 281 × 10^-10
a = 562 × 10^-10 cm

Density is calculated hy -
d = (Z.M) / (NA.a^3)
NA = ZM / da^3
NA = (4 × 58.5) / [2.165×(562×10^-10)^3]
NA = 6.089×10^23 molecules/mol

Therefore, value of Avogadro's number is 6.089×10^23.

Hope this helps yoi...