a
પાણીના મોલ અંશ \(({X_{{H_2}O}})\, = \,0.85\, = \,\frac{N}{{n\, + \,N}}\,\)

\(\,\therefore {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\) ના મોલ અંશ

 \(({X_{{H_2}S{O_4}}})\, = \,0.15\, = \,\frac{n}{{n\, + \,N}}\,\)

\(\therefore \,\,{H_2}S{O_4}\,\) ના મોલ અંશ \(({X_{{H_2}S{O_4}}})\, = \,0.15\, = \,\frac{n}{{n\, + \,N}}\)

\(\,\therefore \,\frac{{0.15}}{{0.85}}\, = \,\frac{n}{N}\)

પાણીના મોલ \( (N) = 1000/18 = 55.55\)  થાય. 

\(\therefore \,n\, = \,\frac{{0.15\, \times \,N}}{{0.85}}\, = \,\frac{{0.15\, \times \,55.55}}{{0.85}}\, = \,9.80\)