Chapter23 Kinetics PhotoChemistry Radiation

Example 23.1, Page no.82

In [7]:
import math
#initialisation of variables
k=9.12*10** -4 # secˆ−1 
H=25100 # cal moleˆ−1 
S=-10.6 # cal degˆ−1 moleˆ−1 
#RESULTS 
print 'Entropy of activation =',S,'cal degˆ−1 moleˆ−1'
Entropy of activation = -10.6 cal degˆ−1 moleˆ−1

Example 23.2, Page no.82

In [8]:
import math
#initialisation of variables
h= 6.62*10** -27 # ergs / sec
c= 3*10**10 #cm/ sec
wl= 4358 #A
I= 14000 # ergs secˆ−1
p= 80.1 # percent
t= 1105 # sec
n= 0.075 # millimole 
#CALCULATIONS 
E= h*c/(wl*10**-8) 
q= I*p*t/(100*E) 
M= 6*10**23*n*10**-3 
P= M/q 
#RESULTS 
P=round(P,2)
print  'quantum yield =',P
quantum yield = 16.55

Example 23.4, Page no.83

In [9]:
import math
#initialisation of variables
a=43560 # f t ˆ−2 
t= 500 #min dayˆ−1
E= 1000 # cal minˆ−1 f t ˆ−2
m= 2 # tons acreˆ−1
E1= 4000 # cal gramˆ−1
M= 9.07*10**5 #gram tonˆ−1
#CALCULATIONS 
Sh= a*t*E*365.26
Hs= m*M*E1
r= Hs/Sh
#RESULTS
r=round(r,6)
print 'fraction of solar energy stored =',r
fraction of solar energy stored = 0.000912

Example 23.5, Page no.83

In [6]:
import math
#initialisation of variables
h=6.625*10**-27 # ergs /mole
f=2.65*10**-5 # secˆ−1
c=3*10**10 #cm/ sec
t=2
N=6*10**23 # molecules
M=382 #gms
E1=750 # ergs 
#CALCULATIONS 
E=h*c/f 
n1=E1/E 
m=n1/(t*7) 
G=m*M/N 
#RESULTS
m=m*10**-12
m=round(m,2)
G=G*10**9
G=round(G,2)
print 'number of quanta =',n1
print 'number of quanta =',m,'* 10**12 molecules'
print 'grams per day=',G,'*10**-9 gms'
number of quanta = 1e+14
number of quanta = 7.14 * 10**12 molecules
grams per day= 4.55 *10**-9 gms