Question

Ello❣️

please solve this numerical :-




▶️2. Calculate the value of Avogadro constant from the following data :
Density of NaCl = 2.165 g/cm3
Distance between Na+ and Cr in NaCl = 281 pm.
.​

Answer 1

Answer:

According to the formula

d=(Z* M)/ NA*V where d= density, Z= no. of atoms per unit cell which in case of NaCl will be 4, M= mol. mass, NA= Value of Avogadro no., V= Volume, the answer to your question can be easily calculated.

Firstly remember for NaCl lattice,

a=2(r+ + r−)

= 2( 281)

= 562 pm

also, Mol. mass for NaCl will be 58.5

then,

d= (Z *M) / NA * V ... { Note, V (volume) = a³)

2.165= 4 * 58.5 / NA * (562 * 10^-10)³

You'll get NA= 6.02 * 10^23

Explanation:

plz mark as brainlist plz