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A detergent (C(12)H(25)SO(4)Na) solution...

A detergent `(C_(12)H_(25)SO_(4)Na)` solution becomes a colloidal solution at a concentration of `10^(-3)` mol/lit. On an average `10^(13)` colloidal particles are present in `1 mm^(3)` what is average number is `C_(12)H_(25)SO_(4)Na` in one colloidal particle ?

Text Solution

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The correct Answer is:
`60`
1 litre colloidal solution contains `= 10^(-3) xx N_(A)` molecule of `C_(12)H_(25)SO_(4)Na`.
`1 mm^(3)` colloidal solution contains `= (10^(-3) xx N_(A) xx 1)/(10^(6)) = 6 xx 10^(14)` molecule of `C_(12)H_(25)SO_(4)Na`.
`10^(13)` colloidal particles `= 6 xx 10^(14)` molecule of `C_(12)H_(25)SO_(4)Na`.
1 colloidal particle `= (6 xx 10^(14))/(10^(13))` molecule of `C_(12)H_(25)SO_(4)Na = 60` molecules.
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