Question

Density of crystalline nacl is 2.165gmcm−3. what would be the volume of the cube containing one mol of nacl ?

Answer 1

Answer:

M is the molecular mass of NaCl crystal. And N is the Avogadro's number of atoms.

Since there are 2N ions in one gram molecule,

The mass associated with each ion = M/2N

pd3 = M/2N

d = [M/2N x p]1/3

Here M = 58.5 g = 58.5 X10-3 kg

N = 6.023x1023

p= 2.165 g/cm3 = 2.165x10-3 kg.m-3

d = [58.5 X10-3/6.023x1023 x 2.165x10-3]1/3

d = 2.814 x10-10 m

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