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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 7 : A General Strategy for Solving Material Balance Problems"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      " Example 7.1 Page no.169\n"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Understanding the Problem\n",
+      "# Solution\n",
+      "\n",
+      "# Variables\n",
+      "v_ts = 105.0 ;          # velocity of train wrt station-[cm/s]\n",
+      "v_mt = 30.0 ;           # velocity of man wrt train-[cm/s]\n",
+      "v_hm = 2.0 ;            # velocity of hot dough wrt man-[cm/s]\n",
+      "v_am = 1.0 ;            # velocity of ant wrt man- [cm/s]\n",
+      "# By careful reading of problem you can see that ant is moving away from man's mouth at 1 cm/s , so ant's velocity wrt station \n",
+      "#is say v_as\n",
+      "\n",
+      "# Calculation\n",
+      "v_as  =  v_ts + v_mt + v_am;\n",
+      "\n",
+      "# Results\n",
+      "print ' The ant is moving towards station at the rate of %.1f cm/s.'%v_as"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The ant is moving towards station at the rate of 136.0 cm/s.\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      " Example 7.4 Page no. 180\n"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Drawing a Sketch of a Mixing Process\n",
+      "# Solution\n",
+      "\n",
+      "# Variables\n",
+      "n_un= 7 ;            # Number of unknowns in the given problem- 3 values of xi and 4 values Fi\n",
+      "n_ie = 5 ;           # Number of independent equations\n",
+      "\n",
+      "# Calculations\n",
+      "d_o_f = n_un-n_ie ;  # No. of degree of freedom\n",
+      "\n",
+      "# Results\n",
+      "print 'Number of degree of freedom for the given system is  %i .'%d_o_f"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number of degree of freedom for the given system is  2 .\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      " Example 7.5  Page no. 182\n"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Placing the unknown Information on the Diagram\n",
+      "# Solution\n",
+      "\n",
+      "# variables\n",
+      "n_un=8 ;          # Number of unknowns in the given problem- 8 values of mole fractions\n",
+      "n_ie =6 ;         # Number of independent equations- six elemental balances \n",
+      "\n",
+      "# Calculation\n",
+      "d_o_f= n_un-n_ie ;# Number of degree of freedom\n",
+      "\n",
+      "# Results\n",
+      "print 'Number of degree of freedom for the given system is %i .'%d_o_f\n",
+      "#Note: Experiments show that the change in CH1.8O.5N.16S.0045P.0055 and the change in C(alpha)H(beta)O(gamma) prove to be \n",
+      "#related by amount of biomass present and the maintenance coefficient(the moles of substrate per mole of biomass per second) \n",
+      "#so the respective quantities cannot be chosen independently.Consequently with this extra constraint,only one degree of freedom \n",
+      "#remains to be specified, the basis"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number of degree of freedom for the given system is 2 .\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "code",
+     "collapsed": true,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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