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diff --git a/Textbook_of_Engineering_Chemistry/dChapter_10.ipynb b/Textbook_of_Engineering_Chemistry/dChapter_10.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 10:Polymer Chemistry"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example no:1,Page no:272"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "#Variable declaration\n",
+      "N1=5.0 #no of molecules#\n",
+      "N2=10.0 \n",
+      "N3=20.0 \n",
+      "N4=20.0 \n",
+      "N5=10.0 \n",
+      "M1=5000.0 #molecular mass of each molecule#\n",
+      "M2=6000.0 \n",
+      "M3=10000.0 \n",
+      "M4=15000.0 \n",
+      "M5=25000.0 \n",
+      "\n",
+      "#Calculation\n",
+      "M=(M1*N1+M2*N2+M3*N3+M4*N4+M5*N5)/(N1+N2+N3+N4+N5) #formula for number average molecular mass#\n",
+      "Mw=(N1*M1**2+N2*M2**2+N3*M3**2+N4*M4**2+N5*M5**2)/(M1*N1+M2*N2+M3*N3+M4*N4+M5*N5) #formula of weight-average molecular mass#\n",
+      "\n",
+      "#Result\n",
+      "print\"The number average molecular mass is %.2e\"%M\n",
+      "print\"\\nThe weight average molecular mass is %.2e\"%Mw"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The number average molecular mass is 1.28e+04\n",
+        "\n",
+        "The weight average molecular mass is 1.59e+04\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file