Chapter8 Properties of Dilute Solutions

Example 8.2, Pageno.32

In [3]:
import math
#initialisation of variables
R=1.987       #in cal /mole K
T=100.0         #in Celsius
M1=18.02      #in gms
Hvap=539.7    #cal gˆ−1
#CALCULATIONS
Kb=R*(273.1+T)**2*M1/(1000*M1*Hvap)
#RESULTS
Kb=round(Kb,3)
print 'molal boiling point constant=',Kb,'f deg molalˆ−1'
molal boiling point constant= 0.513 f deg molalˆ−1

Example 8.3, Pageno.32

In [4]:
import math
#initialisation of variables
Kb=2.53        #in deg molalˆ−1
w2=1           #in gms
Tb=0.3         #in Celsius
w1=50          #in gms
#CALCULATIONS
M2=Kb*w2*1000/(Tb*w1)
#RESULTS
M2=round(M2,2)
print 'molecular weight of dinitrozene =',M2,'g moleˆ−1'
molecular weight of dinitrozene = 168.67 g moleˆ−1

Example 8.4, Pageno.33

In [5]:
import math
#initialisation of variables
mu=5.0           #in gms
Mu=60.06       #in gms
mw=75.0          #in gms
#CALCULATIONS
Tb=0.513*mu*1000/(Mu*mw)
#RESULTS
Tb=round(Tb,3)
print 'boiling water of a solution=',Tb,'deg'
boiling water of a solution= 0.569 deg

Example 8.5, Pageno.33

In [6]:
import math
#initialisation of variables
R=1.987       #in cal moleˆ−1 Kˆ−1
T=0           #in Celsius units
M=18.02       #in gms
Hf=79.7       #in cal gˆ−1
#CALCULATIONS
Kf=R*(273.1+T)**2*M/(1000*M*Hf)
#RESULTS
Kf=round(Kf,3)
print 'Kf of water=',Kf,'deg molalˆ−1'
Kf of water= 1.859 deg molalˆ−1

Example 8.6, Pageno.34

In [7]:
import math
#initialisation of variables
M=18.02      #in g moleˆ−1
d=0.99564    #in g/ cc
R=0.08205    #in l−atm degˆ−1 moleˆ−1
T=30         #in Celsius
P1=31.824    #in mm
P10=31.207   # in mm
#CALCULATIONS
p=R*(273.15+T)*2.303*1000*d*math.log10(P1/P10)/M
#RESULTS
p=round(p,3)
print 'osmotic pressure of sucrose solution=',p,'atm'
osmotic pressure of sucrose solution= 26.911 atm

Example 8.7, Pageno.34

In [8]:
import math
#initialisation of variables
R=0.082       #in l−atm / mol ˆ−1 Kˆ−1
T=30          #in C
V=1           #in litres
#CALCULATIONS
p=R*(273.15+T)/V 
#RESULTS
p=round(p,2)
print 'osmotic pressure of sucrose solution=',p,'atm'
osmotic pressure of sucrose solution= 24.86 atm