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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter19 Statistical Mechanics"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 19.1,Page no.73"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Wabc = 6\n",
+      "Waab = 3\n",
+      "Waaa = 1\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "Na=1\n",
+    "Nb=1\n",
+    "Nc=1\n",
+    "Na1=2\n",
+    "Nb1=1\n",
+    "Nc1=0\n",
+    "Na2=3 \n",
+    "Nb2=0 \n",
+    "Nc2=0 \n",
+    "#CALCULATIONS \n",
+    "Wabc=math.factorial(Na+Nb+Nc)/(math.factorial(Na)*math.factorial( Nb)*math.factorial(Nc))\n",
+    "Waab=math.factorial(Na1+Nb1+Nc1)/(math.factorial(Na1)*math.factorial(Nb1)*math.factorial(Nc1))\n",
+    "Waaa=math.factorial(Na2+Nb2+Nc2)/(math.factorial(Na2)*math.factorial(Nb2)*math.factorial(Nc2))\n",
+    "#RESULTS\n",
+    "print 'Wabc =',Wabc\n",
+    "print 'Waab =',Waab\n",
+    "print 'Waaa =',Waaa"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 19.2,Page no.74"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Enthalpy = 36.586 cal degˆ−1 moleˆ−1\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "K=4.9860 # cal degˆ−1 moleˆ−1\n",
+    "K1=-31.6 # cal degˆ−1 moleˆ−1\n",
+    "#CALCULATIONS\n",
+    "S=K-K1\n",
+    "#RESULTS\n",
+    "S=round(S,3)\n",
+    "print 'Enthalpy =',S,'cal degˆ−1 moleˆ−1'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 19.4,Page no.74"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Transitional energy 31.704 cal degˆ−1 mole ˆ−1\n",
+      "rotational energy = 5.916 cal degˆ−1 mole ˆ−1\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "No=0.979889\n",
+    "v=2989.74 #cmˆ−1\n",
+    "rc=1.2746 #A\n",
+    "T=25 #C\n",
+    "E1=6.8635 # cal degˆ−1 moleˆ−1\n",
+    "E2=11.4392 # cal degˆ−1 moleˆ−1 \n",
+    "E3= 7.2820 # cal degˆ−1 moleˆ−1 \n",
+    "E4= 4.5757 # cal degˆ−1 moleˆ−1 \n",
+    "E5= 2.7676 # cal degˆ−1 moleˆ−1 \n",
+    "r1= 0.265 #A \n",
+    "r= 35.99 #A \n",
+    "#CALCULATIONS \n",
+    "Et=E1*math.log10(r)+E2*math.log10 (273.15+T)-E3\n",
+    "Ei=E4*math.log10(r1)+E4*math.log10 (273.15+T)-E5\n",
+    "#RESULTS\n",
+    "Et=round(Et,3)\n",
+    "Ei=round(Ei,3)\n",
+    "print 'Transitional energy',Et,'cal degˆ−1 mole ˆ−1'\n",
+    "print 'rotational energy =',Ei,'cal degˆ−1 mole ˆ−1'"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python [Root]",
+   "language": "python",
+   "name": "Python [Root]"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
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+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
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