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diff --git a/Physical_Chemsitry/Chapter_9.ipynb b/Physical_Chemsitry/Chapter_9.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:39eab768daff11aebdd87a93356bef21d5d2b1bdfeb10c1efcd7ba6d3163e0fd"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 9 - Statistical Mechanics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2 - pg 525"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the Absolute Entropy\n",
+      "#initialisation of variables\n",
+      "import math\n",
+      "T= 298.16 #K\n",
+      "M= 4.003 #gm\n",
+      "S= 2.3151 #cal mol^-1 deg^-1\n",
+      "R= 1.987 #cal/molK\n",
+      "#CALCULATIONS\n",
+      "S1= 2.5*R*math.log(T)+1.5*R*math.log(M)-S\n",
+      "#RESULTS\n",
+      "print '%s %.3f %s' % (' Absolute Entropy=',S1,'cal mol^-1 deg^-1')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Absolute Entropy= 30.122 cal mol^-1 deg^-1\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3 - pg 528"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the heat required\n",
+      "#initialisation of variables\n",
+      "h= 6.624*10**-27#erg/sec\n",
+      "N= 6.023*10**23\n",
+      "c= 3*10**10 #m/sec\n",
+      "w= 2359.6 #cm**-1\n",
+      "T= 2000 #K\n",
+      "K= 1.380*10**-16\n",
+      "R= 1.987 #cal mol**-1 k**-1\n",
+      "#CALCULATIONS\n",
+      "x= h*c*w/(K*T)\n",
+      "y= 2.71**x\n",
+      "H= 3.5*R+(N*h*c*w/(T*4.184*10**7*(y-1)))\n",
+      "#RESULTS\n",
+      "print '%s %.3f %s' % (' Heat=',H,'cal mol**-1 deg**-1')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Heat= 7.715 cal mol**-1 deg**-1\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file