# Chapter 27 :Solutions¶

## Example 27.3 , Page no:165¶

In [1]:
import math
from __future__ import division

#initialisation of variables
f=(137.34)+(70.92); #cal formula mass
f1=75/f;

#RESULTS
print"Formula mass =",round(f,3);
print"Moles =",round(f1,4);

Formula mass = 208.26
Moles = 0.3601


## Example 27.4 , Page no:165¶

In [2]:
import math
from __future__ import division

#initialisation of variables
a=2*0.12;

#RESULTS
print"Moles =",round(a,3);

Moles = 0.24


## Example 27.5 , Page no:165¶

In [3]:
import math
from __future__ import division

#initialisation of variables
l=0.082/2;

#RESULTS
print"Litres =",round(l,3);

Litres = 0.041


## Example 27.6 , Page no:165¶

In [4]:
import math
from __future__ import division

#initialisation of variables
m=2*170;

#RESULTS
print"Mass =",round(m,3);

Mass = 340.0


## Example 27.7 , Page no:166¶

In [5]:
import math
from __future__ import division

#initialisation of variables
m=0.075*111;

#RESULTS
print"Mass =",round(m,3);

Mass = 8.325


## Example 27.8 , Page no:166¶

In [6]:
import math
from __future__ import division

#initialisation of variables
m=4/166;
l=0.024/0.8;

#RESULTS
print"Moles =",round(m,3);
print"Litres =",round(l,3);

Moles = 0.024
Litres = 0.03


## Example 27.9 , Page no:166¶

In [7]:
import math
from __future__ import division

#initialisation of variables
m=12.01+32.00; #cal mass
m1=3.3/m;

#RESULTS
print"Moles =",round(m1,3);

Moles = 0.075


## Example 27.11 , Page no:166¶

In [8]:
import math
from __future__ import division

#initialisation of variables
m=20/180;
m1=0.11/0.05;

#RESULTS
print"Moles =",round(m,3);
print"Molality =",round(m1,3);

Moles = 0.111
Molality = 2.2


## Example 27.12 , Page no:166¶

In [9]:
import math
from __future__ import division

#initialisation of variables
m=24.02+6.05+32.00; #cal mass
m1=m*13.4;

#RESULTS
print"Mass =",round(m1,3);

Mass = 831.738


## Example 27.14 , Page no:167¶

In [10]:
import math
from __future__ import division

#initialisation of variables
m=0.91/0.52; #cal molality
m1=m*0.5;
m2=300/(m*0.5);

#RESULTS
print"Moles =",round(m1,3);
print"Molecular Mass =",round(m2,3);

Moles = 0.875
Molecular Mass = 342.857