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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter21 Surface Chemistry"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.1, Page no.79"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "cross −sectional area = 970741.0 cmˆ2\n",
+      "thcikness t of the film = 0.25 * 10^-5 cm\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "A=500.0 #cmˆ2\n",
+    "m=0.106 #mg\n",
+    "N=6*10*23 # molecules\n",
+    "M=284.0 #g moleˆ−1\n",
+    "d=0.85 #g/cmˆ3\n",
+    "#CALCULATIONS\n",
+    "A1=A*M/(N*m*10**-3) \n",
+    "t= m*(10**-3)/((A*d)*(10**-6)) \n",
+    "#RESULTS\n",
+    "A1=round(A1,1)\n",
+    "t=round(t,2)\n",
+    "print 'cross −sectional area =',A1,'cmˆ2'\n",
+    "print 'thcikness t of the film =',t,'* 10^-5 cm'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.2, Page no.79"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Surface area per gram of gel = 559.8 * 10^10 mˆ2 gˆ−1\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "V=129 #ml gˆ−1 \n",
+    "N=6*10**23 # molecules \n",
+    "A=16.2 #Aˆ2 \n",
+    "#CALCULATIONS \n",
+    "SA=V*N*A/((22.4)*10**23 )\n",
+    "#RESULTS\n",
+    "SA=round(SA,1)\n",
+    "print 'Surface area per gram of gel =',SA,'* 10^10 mˆ2 gˆ−1'"
+   ]
+  }
+ ],
+ "metadata": {
+  "anaconda-cloud": {},
+  "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",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}