Critical micelle concentration (CMC) of a cationic colloidal electrolyte is ${10}^{-3}M$ . If $1m{m}^3$  contain ${10}^{13}$  micelles, the number of cations making one micelle is  $(given,N_A=6\times {10}^{23})$

At  CMC, the number of cationic colloidal particles
$={10}^{-3}\times 6\times {10}^{23}=6\times {10}^{20}perLt$
Number of particles per  
$=\frac{6\times {10}^{20}}{{10}^6}$
$=6\times {10}^{14}particles/m{m}^3$
Number of micelles in  $1m{m}^3={10}^{13}$
Number of cations forming one micelles
$=\frac{6\times {10}^{14}}{{10}^{13}}=60$