Question

Number of unit cells in 0.1 g molecule NaCl is
(1) 0.1 N
(2) 0.025 N.
(3) 0.5 N.
(4) 0.25 N,​

Answer 1

Answer:

So, each unit cell has 4 atoms of each Na+ and Cl-. Hence there are total 4 molecules of NaCl in each unit cell. As the mass of -Avogadro number of molecules- of NaCl is 58.5g. So, 2.575×10^21 unit cells contains 1gm of NaCl molecules

Explanation:

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Answer 2

The number of unit cells in 0.1g molecule NaCl is 0.1N (option 1).

Given,

Molecules of NaCl=0.1g

To Find,

How many units of cells in 0.1g NaCl.

Solution,

we can solve this type of problem by the following process.

Now,

Molecules of NaCl=0.1g

The molecular weight of NaCl=58.5

Number of molecules in 1gram

$= \frac{6 .022 \times {10}^{23} }{58.5 }$

$= 1.03 \times {10}^{22}$

Hence, The number of unit cells in 0.1g molecules is 0.1Na.