Calculate the formality of NaCl solution having 1.78 gm solute dissolved in 178 ml solution.

1.78 F

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16 F

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0.17 F

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1.7 F

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Solution

The correct option is C
0.17 F

Recollect that,
$F o r m a l i t y = \frac{f o r m u l a m a s s o f s o l u t e}{V o l u m e o f s o l u t i o n (i n l i t r e s)}$

Formula mass of a solute is calculated just like molecular mass, but the only difference is that it is calculated for ionic solids.
$∴$ Formula mass of NaCl = 23 + 35.5 = 58.5
Formality= $\frac{1.78}{58.5} \times \frac{1000}{178} = 0.17 F$

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