import math
from __future__ import division
#initialisation of variables
p= 388.6 #mm
p1=26.5 #mm
T= 60 #C
R= 1.99 #cal mole^-1 A^-1
#CALCULATIONS
Lv= math.log10(p/p1)*2.303*R*273*(273+T)/(T)
#RESULTS
print"heat of vapourisation of benzene=",round(Lv+2),"cal per mole";
import math
from __future__ import division
#initialisation of variables
d= 0.789 #gram per cc
r= 0.010 #cm
h= 5.76 #cm
g= 980.7 # cm /sec^2
#CALCULATIONS
R= d*h*r*g/2
#RESULTS
print"Surface tension=",round(R,1)," dynes per cm";
import math
from __future__ import division
#initialisation of variables
W= 0.220 #gms
g= 980.7 #cm per sec62
f= 0.98
l= 4 #cm
#CALCULATIONS
T= W*g/(2*l)
Tc= T*f
#RESULTS
print"apparent surface tension=",round(T,1),"dynes per cm";
print"exact surface tension=",round(Tc,1),"dynes per cm";
import math
from __future__ import division
#initialisation of variables
n2= 10.05*10**-3 #poise
d1= 0.879 #gms cm^-3
t= 88 #sec
d2= 1 #gms cm^-3
t1= 120 #sec
#CALCULATIONS
n1= d1*t/(d2*t1)
#RESULTS
print"relative viscosity=",round(n1,3);