\( = \,\,\frac{X}{{X\,\, + \,\,\frac{{1000}}{{78}}}}\,\, = \,\,\frac{X}{{X\,\, + \,\,12.82}}\)
\( \Rightarrow \,\,0.2\,\, = \,\,\,\frac{X}{{X\,\, + \,\,12.82}}\) \( \Rightarrow \,\,X\,\, = \,\,3.2\)
[$A =100 \,g\, mol ^{-1} ; B =200 \,g\, mol ^{-1}$$ C =10,000 \,g\, mol ^{-1}$ના મોલર દળ આપેલ છે ]