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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4 - Thermodynamics: the Second Law"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example I1 - Pg 80"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the entropy change at 273 and 373 K\n",
"#Initialization of variables\n",
"H=100. #kJ\n",
"T1=273. #K\n",
"T2=373.#K\n",
"#calculations\n",
"S1=H*1000/T1\n",
"S2=H*1000/T2\n",
"#results\n",
"print '%s %d %s' %('Entropy change at 273 K is',S1,'J/K ')\n",
"print '%s %d %s' %('\\n Entropy change at 373 K is',S2,'J/K ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Entropy change at 273 K is 366 J/K \n",
"\n",
" Entropy change at 373 K is 268 J/K \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example I2 - Pg 84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the enthalpy of vaporization\n",
"#Initialization of variables\n",
"T=59.2 #K\n",
"#calculations\n",
"Hvap=85*(273.2+T)/1000.\n",
"#results\n",
"print '%s %d %s' %('Enthalpy of vaportization =',Hvap,'kJ/mol')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enthalpy of vaportization = 28 kJ/mol\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example I3 - Pg 88"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the change in entropy\n",
"#Initialization of variables\n",
"SH2O=70 #J/K mol\n",
"SH2=131 #J/K mol\n",
"SO2=205 #J/K mol\n",
"#calculations\n",
"deltaS=2*SH2O-2*SH2-SO2\n",
"print '%s %d %s' %('Change in entropy =',deltaS,'J/K mol')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Change in entropy = -327 J/K mol\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E1 - Pg 84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the net heat transferred and entropy production per day\n",
"#Initialization of variables\n",
"Power=100. #W\n",
"time=1 #day\n",
"T=20 #C\n",
"#calculations\n",
"timeins=1*24*3600\n",
"qsurr=timeins*Power\n",
"Ssurr=qsurr/(T+273.)\n",
"#results\n",
"print '%s %d %s' %('Heat transferred to surroundings =',qsurr,'J')\n",
"print '%s %.2e %s' %('\\n Entropy production per day =',Ssurr,'J/k')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Heat transferred to surroundings = 8640000 J\n",
"\n",
" Entropy production per day = 2.95e+04 J/k\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E2 - Pg 92"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the amount of food bird must consume\n",
"#Initialization of variables\n",
"import math\n",
"g=9.81 #m/s^2\n",
"m=30*math.pow(10,-3) #kg\n",
"d=10 #m\n",
"H=2.828*math.pow(10,6) #j/mol\n",
"M=180. #g/mol\n",
"#calculations\n",
"w=g*m*d\n",
"n=w/H\n",
"m=n*M\n",
"#results\n",
"print '%s %.1e %s' %('Amount bird must consume =',m,'g')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Amount bird must consume = 1.9e-04 g\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
