Ebuloskopska konstanta zadatak

Nena1311's picture

Temp. kljucanja 8% rastvora nekog organskog jedinjenja u benzenu je 80.9 stepeni celzijusovih. Izracunati molarnu masu tog organskog jedinjenja.

milicaradenkovic's picture

dT=Kb*b*i i=1 neelektrolit

b=n/m(rastvaraca)

b=w/(Mr-Mr*w)

(80.9-80.1)=2.53*b

b=0.8/2.53=0.316 mol/kg

0.316=0.08/(Mr-Mr*0.08)

0.316*Mr-0.025*Mr=0.08

0.291*Mr=0.08

Mr=0.08/0.291=0.2749 kg/mol=274.9 g/mol