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Q.

Common salt obtained from sea-water contains 8.775% NaCl by mass. The number of formula units of NaCl present in 25 g of this salt is :

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a

3.176 x 10²³ formula units

b

4.73 x 10²⁵ formula units

c

2.258 x 10²² formula units

d

3.367 x 10²³ formula units

answer is B.

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Detailed Solution

Mass of NaCl $= 25 \times \frac{8.775}{100} = 2.193 g$
Number of NaCl units $= \frac{2 .193}{58 .5} \times N_{A}$
=2.25 x10²²

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