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{
"metadata": {
"name": "",
"signature": "sha256:7c7e50fa2880e870c4aa1630bafd7d049a3cb3c4e646a0d88068a55be4a3d00f"
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 16:INTRODUCTION TO PHASE AND CHEMICAL EQUILIBRIUM"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.2:PG-681"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#ques2\n",
"#to determine change in gibbs free energy\n",
"\n",
"#1-H2\n",
"#2-O2\n",
"#3-H2O\n",
"\n",
"#at T=298 K\n",
"T1=298.0;#K\n",
"Hf1=0;#Enthalpy of formation of H2 at 298 K\n",
"Hf2=0;#Enthalpy of formation of O2 at 298 K\n",
"Hf3=-241826;#enthalpy of formation of H2O at 298 K in kJ\n",
"dH=2*Hf1+Hf2-2*Hf3;#Change in enthalpy in kJ\n",
"Sf1=130.678;#Entropy of H2 at 298 K n kJ/K\n",
"Sf2=205.148;#Entropy of O2 at 298 K in kJ/K\n",
"Sf3=188.834;#entropy of H2O at 298 K in kJ/K\n",
"dS=2*Sf1+Sf2-2*Sf3;#Change in entropy in kJ/K\n",
"dG1=dH-T1*dS;#change n gibbs free energy in kJ\n",
"print\" Change in gibbs free energy at\",T1,\"kelvin is\",round(dG1),\"kJ \"\n",
"#at T=2000 K\n",
"T2=2000.0;#K\n",
"Hf1=52942-0;#Enthalpy of formation of H2 at 2000 K\n",
"Hf2=59176-0;#Enthalpy of formation of O2 at 2000 K\n",
"Hf3=-241826+72788;#enthalpy of formation of H2O at 2000 K in kJ\n",
"dH=2*Hf1+Hf2-2*Hf3;#Change in enthalpy in kJ\n",
"Sf1=188.419;#Entropy of H2 at 2000 K n kJ/K\n",
"Sf2=268.748;#Entropy of O2 at 2000 K in kJ/K\n",
"Sf3=264.769;#entropy of H2O at 2000 K in kJ/K\n",
"dS=2*Sf1+Sf2-2*Sf3;#Change in entropy in kJ/K\n",
"dG2=dH-(T2*dS);#change n gibbs free energy in kJ\n",
"print\" Change in gibbs free energy at\",T2,\"kelvin is\",round(dG2),\" kJ \""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Change in gibbs free energy at 298.0 kelvin is 457179.0 kJ \n",
" Change in gibbs free energy at 2000.0 kelvin is 271040.0 kJ \n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex16.3:PG-683"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#ques3\n",
"#calculating equilibrium constant \n",
"\n",
"dG1=-457.166;#change in gibbs free energy at temp 298 K from example2 in kJ\n",
"dG2=-271.040;#change in gibbs free energy at temp 2000 K from example2 n kJ\n",
"T1=298;#K\n",
"T2=2000;#K\n",
"R=8.3145;#gas constant\n",
"K1=dG1*1000/(R*T1);\n",
"K2=dG2*1000/(R*T2);\n",
"print\" Equilibrium constant at \",T1,\"K = \",round(K1,2)\n",
"print\" Equilibrium constant at \",T2,\"K = \",round(K2,3)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Equilibrium constant at 298 K = -184.51\n",
" Equilibrium constant at 2000 K = -16.299\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
