Koncentracija

mr=m(rastvaraca)+ms

m(rastvaraca)=mr-ms

b=n/m(rastvaraca)

1.008=ms/Mr*(0.2-ms)

1.008*0.106*0.2-1.008*0.106*ms=ms

0.02137=ms+0.107

1.107*ms=0.02137

ms=0.02137/1.107=0.01931 kg=19.31 g

Mr=0.106 kg/mol a mr=0.2 kg sve mora da se pretvori u kg jer je molalitet u mol/kg