3 If w2 gram of solute of molar mass M2
is dissolved in w1 gram of solvent, then molality, m of the solution is
given by the expression:
m
= 
2
2
1
/M  
/1000
ww
 = 
2
2
1
1000 × 
 × 
M
ww
(1 31)
Substituting the value of molality in equation (1 30) we get
DTb = 
b
2
2
1
 × 1000 × 
 × 
K
M
w
w
(1