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diff --git a/Thermodynamics:_From_concepts_to_applications/Chapter15_1.ipynb b/Thermodynamics:_From_concepts_to_applications/Chapter15_1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:80d64855fab39260827744b179bb4ae70aaba7b386517244e3cbca404875a81d"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter15-multicomponet systems"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example1-pg332"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#calculate volume of the phase\n",
+      "##initialisation of variables\n",
+      "m2= 50. ##gms\n",
+      "M= 46. ##gms\n",
+      "m1= 50. ##gms\n",
+      "M1= 18. ##gms\n",
+      "v1= 17402. ##cm^3/kmol\n",
+      "v2= 56090. ##cm^3/kmol\n",
+      "##CALCULATIONS\n",
+      "x2= (m2/M)/((m2/M)+(m1/M1))\n",
+      "V= (v1*(m1/M1)+v2*(m2/M))*math.pow(10,-3)\n",
+      "##RESULTS\n",
+      "print'%s %.1f %s'% ('volume of the phase=',V,'cm^3')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "volume of the phase= 109.3 cm^3\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example2-337"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#calcualte difference in enthalpy and amount of heat removed\n",
+      "##initialisation of variables\n",
+      "nw= 9 ##kmol\n",
+      "na= 1 ##kmol\n",
+      "##CALCULATIONS\n",
+      "dh= 75*nw*nw/math.pow(na+1.8*nw,2)\n",
+      "Q= -75*na*nw/(nw+1.8*na)\n",
+      "##RESULTS\n",
+      "print'%s %.2f %s'%  ('difference in enthalpy=',dh,'kJ/kg')\n",
+      "print'%s %.1f %s'% ('amount of heat removed=',Q,'kJ')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "difference in enthalpy= 20.53 kJ/kg\n",
+        "amount of heat removed= -62.5 kJ\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file