# Chapter 9 : Entropy determination and Significance¶

## Example 9.1 Page No : 191¶

In [2]:
# Variables
import math
w = 35.46 			#gms
T = 298.2 			#K
Qc = 4.03

# Calculations
S = 4.576*(1.5*math.log10(w)+2.5*math.log10(T)+math.log10(Qc)-0.5055)

# Results
print  'Standard entropy  = %.1f cal deg**-1 g atom**-1'%(S)

Standard entropy  = 39.4 cal deg**-1 g atom**-1


## Example 9.2 Page No : 195¶

In [3]:
# Variables
import math
M = 28.  	    	    	#gms
T = 25.     	    		#C
I = 13.9*10**-40 			# gcm**2
s = 2

# Calculations
S = 4.576*(1.5*math.log10(M)+2.5*math.log10(273.2+T)-0.5055)
S1 = 4.576*(math.log10(I)+math.log10(273.2+T)-math.log10(s)+38.82)

# Results
print  'Standard entropy  = %.1f E.U.mole**-1'%(S)
print  ' Standard entropy  = %.1f E.U.mole**-1'%(S1)

Standard entropy  = 35.9 E.U.mole**-1
Standard entropy  = 9.8 E.U.mole**-1


## Example 9.3 Page No : 196¶

In [4]:
# Variables
import math
T = 25.          			#C
I = 4.33*10**-40 			# gcm**2
I1 = 2.78*10**-40 			#g cm**2
s = 3

# Calculations
S = 4.576*(0.5*math.log10(I1**2*I)+1.5*math.log10(273.2+T)-math.log10(s)+58.51)

# Results
print  'Standard entropy  = %.1f cal deg**-1 mole**-1'%(S)

Standard entropy  = 11.5 cal deg**-1 mole**-1


## Example 9.4 Page No : 198¶

In [5]:
# Variables
Sco = 47.3 		    	#cal deg**-1
Sh2 = 31.21 			#cal deg**-1
Sc = 1.36 		    	#cal deg**-1
Sho  = 16.75 			#cal deg**-1

# Calculations
S = Sco+Sh2-Sc-Sho

# Results
print  'Standard entropy  = %.2f cal deg**-1 mole**-1'%(S)

Standard entropy  = 60.40 cal deg**-1 mole**-1

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