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diff --git a/Fundamentals_Of_Thermodynamics/Chapter15.ipynb b/Fundamentals_Of_Thermodynamics/Chapter15.ipynb
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+{

+ "metadata": {

+  "name": "",

+  "signature": "sha256:49d323999697626f705831867b32f6c520c5287d76ed00656f7259e6db65356e"

+ },

+ "nbformat": 3,

+ "nbformat_minor": 0,

+ "worksheets": [

+  {

+   "cells": [

+    {

+     "cell_type": "heading",

+     "level": 1,

+     "metadata": {},

+     "source": [

+      "Chapter15:CHEMICAL REACTIONS"

+     ]

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Ex15.1:Pg-621"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#ques1\n",

+      "#theoratical air-fuel ratio for combustion of octane\n",

+      "#combustion equation is\n",

+      "#C8H18 + 12.5O2 + 12.5(3.76) N2 \u2192 8 CO2 + 9H2O + 47.0N2\n",

+      "rm=(12.5+47.0)/1;#air fuel ratio on mole basis\n",

+      "rma=rm*28.97/114.2;#air fuel ratio on mass basis;\n",

+      "print \"Theoratical air fuel ratio on mass basis is\",round(rma),\"kg air/kg fuel\"\n",

+      "\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        " Theoratical air fuel ratio on mass basis is 15.0 kg air/kg fuel\n"

+       ]

+      }

+     ],

+     "prompt_number": 3

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Ex15.6:Pg-629"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#ques6\n",

+      "#determining heat transfer per kilomole of fuel entering combustion chamber\n",

+      "\n",

+      "#1-CH4\n",

+      "#2-CO2\n",

+      "#3-H2O\n",

+      "#hf-standard enthalpy of given substance\n",

+      "hf1=-74.873;#kJ\n",

+      "hf2=-393.522;#kJ\n",

+      "hf3=-285.830;#kJ\n",

+      "Qcv=hf2+2*hf3-hf1;#kJ\n",

+      "print \"Heat transfer per kilomole of fuel entering combustion chamber is\",round(Qcv,3),\"kJ\"\n",

+      "#the answers in the book is different as they have not printed the decimals in values"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "Heat transfer per kilomole of fuel entering combustion chamber is -890.309 kJ\n"

+       ]

+      }

+     ],

+     "prompt_number": 5

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Ex15.7:Pg-631"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#ques7\n",

+      "#calculating enthalpy of water at given pressure and temperature\n",

+      "\n",

+      "#1.Assuming steam to be an ideal gas with value of Cp\n",

+      "T1=298.15;#Initial temperature in K\n",

+      "T2=573.15;#final temperature in K\n",

+      "T=(T1+T2)/2;#average temperature in K\n",

+      "Cp=1.79+0.107*T/1000+0.586*(T/1000)**2-.20*(T/1000)**3;#specific heat at constant pressure in kj/kg.K\n",

+      "M=18.015;#mass in kg\n",

+      "dh=M*Cp*(T2-T1);#enthalpy change in kJ/kmol\n",

+      "ho=-241.826;#enthalpy at standard temperature and pressure in kJ/mol\n",

+      "htp1=ho+dh/1000;#enthalpy at given temp and pressure in kJ/kmol\n",

+      "print \" 1. Enthalpy of water at given pressure and temperature using value of Cp =\",round(htp1,3),\"kJ/kmol\"\n",

+      "\n",

+      "#2..Assuming steam to be an ideal gas with value for dh\n",

+      "dh=9359;#enthalpy change from table A.9 in kJ/mol\n",

+      "htp2=ho+dh/1000;#enthalpy at given temp and pressure in kJ/kmol\n",

+      "print \" 2. Enthalpy of water at given pressure and temperature assuming value od dh =\",round(htp2,3),\"kJ/kmol \"\n",

+      "\n",

+      "#3. Using steam table\n",

+      "dh=M*(2977.5-2547.2);#enthalpy change for gases in kJ/mol\n",

+      "htp3g=dh/1000+ho;\n",

+      "dh=M*(2977.5-104.9);#enthalpy change for liquid in kJ/mol\n",

+      "hl=-285.830;#standard enthalpy for liquid in kJ/kmol\n",

+      "htp31=hl+dh/1000.0;#enthalpy at given temp and pressure in kJ/kmol\n",

+      "print \" 3.(i) enthalpy at given temp and pressure in kJ/kmol in terms of liquid =\",round(htp31,3),\"kJ/kmol \"\n",

+      "print \" 3.(ii) enthalpy at given temp and pressure in kJ/kmol in terms of liquid =\",round(htp3g,3),\"kJ/kmol \"\n",

+      "#4.using generalised charts\n",

+      "#htp=ho-(h2*-h2)+(h2*-h1*)+(h1*-h1);\n",

+      "#h2*-h2=Z*R*Tc,\n",

+      "#h2*-h1*=9539 kJ/mol, from part 2\n",

+      "#h1*-h1=0 ,as ideal gas \n",

+      "Z=0.21;#from chart\n",

+      "R=8.3145;#gas constant in SI units\n",

+      "Tc=647.3;#critical temperature in K\n",

+      "htp4=ho+9539/1000-Z*R*Tc/1000;#enthalpy at given temp and pressure in kJ/kmol\n",

+      "print \" 4. enthalpy at given temp and pressure in kJ/kmol using compressibility chart = \",round(htp4,3),\"kJ/kmol\"\n",

+      "#the answers in book are different as they have not printed the decimals in values"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        " 1. Enthalpy of water at given pressure and temperature using value of Cp = -232.258 kJ/kmol\n",

+        " 2. Enthalpy of water at given pressure and temperature assuming value od dh = -232.826 kJ/kmol \n",

+        " 3.(i) enthalpy at given temp and pressure in kJ/kmol in terms of liquid = -234.08 kJ/kmol \n",

+        " 3.(ii) enthalpy at given temp and pressure in kJ/kmol in terms of liquid = -234.074 kJ/kmol \n",

+        " 4. enthalpy at given temp and pressure in kJ/kmol using compressibility chart =  -233.956 kJ/kmol\n"

+       ]

+      }

+     ],

+     "prompt_number": 12

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Ex15.15:Pg-649"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#ques15\n",

+      "#calculatng reversible elecromotive force \n",

+      "\n",

+      "#1-H2O\n",

+      "#2-H2\n",

+      "#3-O2\n",

+      "#hf-standard enthalpy \n",

+      "#sf-standard entropy\n",

+      "hf1=-285.830;#kJ\n",

+      "hf2=0;#kJ\n",

+      "hf3=0;#kJ\n",

+      "sf1=69.950;#kJ/K\n",

+      "sf2=130.678;#kJ/K\n",

+      "sf3=205.148;#kJ/K\n",

+      "dH=2*hf1-2*hf2-hf3;#change in enthalpy in kJ\n",

+      "dS=2*sf1-2*sf2-sf3;#change in entropy in kJ/K\n",

+      "T=298.15;#temperature in K\n",

+      "dG=dH-T*dS/1000;#change in gibbs free energy in kJ\n",

+      "E=-dG*1000/(96485*4);#emf in V\n",

+      "print\" Reversible electromotive Force =\",round(E,3),\" V\""

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        " Reversible electromotive Force = 1.229  V\n"

+       ]

+      }

+     ],

+     "prompt_number": 15

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Ex15.17:Pg-654"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#ques17\n",

+      "#efficiency of generator and plant\n",

+      "\n",

+      "q=325000*(3398.3-856.0);#heat transferred to H2O/kg fuel in kJ/kg\n",

+      "qv=26700.0*33250;#higher heating value in kJ/kg\n",

+      "nst=q/qv*100;#efficiency of steam generator\n",

+      "w=81000.0*3600;#net work done in kJ/kg\n",

+      "nth=w/qv*100.0;#thermal efficiency\n",

+      "print\" Efficiency of generator =\",round(nst,1),\"percent\\n\"\n",

+      "print\" Thermal Efficiency =\",round(nth,1),\" percent\"\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        " Efficiency of generator = 93.1 percent\n",

+        "\n",

+        " Thermal Efficiency = 32.8  percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 20

+    }

+   ],

+   "metadata": {}

+  }

+ ]

+}
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