{ "metadata": { "name": "", "signature": "sha256:739f6a7aa866a8931c051faa7d51c479c27f099d05036b55ada1468f0458424b" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter 18: Elementary Chemical Kinetics" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.2, Page Number 451" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log\n", "from sympy import *\n", "\n", "#Variable Declaration\n", "Ca0 = [2.3e-4,4.6e-4,9.2e-4] #Initial Concentration of A, M\n", "Cb0 = [3.1e-5,6.2e-5,6.2e-5] #Initial Concentration of B, M\n", "Ri = [5.25e-4,4.2e-3,1.68e-2] #Initial rate of reaction, M\n", "\n", "#Calculations\n", "alp = log(Ri[1]/Ri[2])/log(Ca0[1]/Ca0[2])\n", "beta = (log(Ri[0]/Ri[1]) - 2*log((Ca0[0]/Ca0[1])))/(log(Cb0[0]/Cb0[1]))\n", "k = Ri[2]/(Ca0[2]**2*Cb0[2]**beta)\n", "\n", "#REsults\n", "print 'Order of reaction with respect to reactant A: %3.2f'%alp\n", "print 'Order of reaction with respect to reactant A: %3.2f'%beta\n", "print 'Rate constant of the reaction: %4.3e 1./(M.s)'%k" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Order of reaction with respect to reactant A: 2.00\n", "Order of reaction with respect to reactant A: 1.00\n", "Rate constant of the reaction: 3.201e+08 1./(M.s)\n" ] } ], "prompt_number": 2 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.3, Page Number 457" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log\n", "from sympy import *\n", "\n", "#Variable Declaration\n", "t1by2 = 2.05e4 #Half life for first order decomposition of N2O5, s\n", "x = 60. #percentage decay of N2O5\n", "\n", "#Calculations\n", "k = log(2)/t1by2\n", "t = -log(x/100)/k\n", "\n", "#REsults\n", "print 'Rate constant of the reaction: %4.3e 1/s'%k\n", "print 'Timerequire for 60 percent decay of N2O5: %4.3e s'%t" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Rate constant of the reaction: 3.381e-05 1/s\n", "Timerequire for 60 percent decay of N2O5: 1.511e+04 s\n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.4, Page Number 457 Incomplete" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log\n", "from sympy import *\n", "\n", "#Variable Declaration\n", "t1by2 = 5760 #Half life for C14, years\n", "\n", "\n", "#Calculations\n", "k = log(2)/t1by2\n", "t = -log(x/100)/k\n", "\n", "#REsults\n", "print 'Rate constant of the reaction: %4.3e 1/s'%k\n", "print 'Timerequire for 60 percent decay of N2O5: %4.3e s'%t" ], "language": "python", "metadata": {}, "outputs": [] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.5, Page Number 463" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log\n", "\n", "#Variable Declaration\n", "kAbykI = 2.0 #Ratio of rate constants\n", "kA = 0.1 #First order rate constant for rxn 1, 1/s \n", "kI = 0.05 #First order rate constant for rxn 2, 1/s \n", "#Calculations\n", "tmax = 1/(kA-kI)*log(kA/kI)\n", "\n", "#Results\n", "print 'Time required for maximum concentration of A: %4.2f s'%tmax" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Time required for maximum concentration of A: 13.86 s\n" ] } ], "prompt_number": 1 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.7, Page Number 467" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log\n", "\n", "#Variable Declaration\n", "T = 22.0 #Temperature of the reaction,\u00b0C\n", "k1 = 7.0e-4 #Rate constants for rxn 1, 1/s\n", "k2 = 4.1e-3 #Rate constant for rxn 2, 1/s \n", "k3 = 5.7e-3 #Rate constant for rxn 3, 1/s \n", "#Calculations\n", "phiP1 = k1/(k1+k2+k3)\n", "\n", "#Results\n", "print 'Percentage of Benzyl Penicillin that under acid catalyzed reaction by path 1: %4.2f '%(phiP1*100)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Percentage of Benzyl Penicillin that under acid catalyzed reaction by path 1: 6.67 \n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.8, Page Number 468" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from numpy import arange,array,ones,linalg,log, exp\n", "from pylab import plot,show\n", "\n", "\n", "#Variable Declaration\n", "T = array([22.7,27.2,33.7,38.0])\n", "k1 = array([7.e-4,9.8e-4,1.6e-3,2.e-3])\n", "R = 8.314 \n", "\n", "#Calculations\n", "T = T +273.15\n", "x = 1./T\n", "y = log(k1)\n", "A = array([ x, ones(size(x))])\n", "# linearly generated sequence\n", "[slope, intercept] = linalg.lstsq(A.T,y)[0] # obtaining the parameters\n", "\n", "# Use w[0] and w[1] for your calculations and give good structure to this ipython notebook\n", "# plotting the line\n", "line = w[0]*x+w[1] # regression line\n", "#Results\n", "plot(x,line,'-',x,y,'o')\n", "xlabel('1/T, $K^{-1}$')\n", "ylabel('log(k)')\n", "show()\n", "Ea = -slope*R\n", "A = exp(intercept)\n", "print 'Slope and intercept are, %6.1f and %4.2f'%(slope, intercept)\n", "print 'Pre-exponential factor and Activation energy are %4.2f kJ/mol and %4.2e 1/s'%(Ea/1e3, A)" ], "language": "python", "metadata": {}, "outputs": [ { "metadata": {}, "output_type": "display_data", "png": 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"text": [ "" ] }, { "output_type": "stream", "stream": "stdout", "text": [ "Slope and intercept are, -6419.8 and 14.45\n", "Pre-exponential factor and Activation energy are 53.37 kJ/mol and 1.88e+06 1/s\n" ] } ], "prompt_number": 54 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.9, Page Number 473" ] }, { "cell_type": "code", "collapsed": false, "input": [ "#Variable Declaration\n", "Ea = 42.e3 #Activation energy for reaction, J/mol\n", "A = 1.e12 #Pre-exponential factor for reaction, 1/s\n", "T = 298.0 #Temeprature, K\n", "Kc = 1.0e4 #Equilibrium constant for reaction\n", "R = 8.314 #Ideal gas constant, J/(mol.K)\n", "#Calculations\n", "kB = A*exp(-Ea/(R*T))\n", "kA = kB*Kc\n", "kApp = kA + kB\n", "\n", "#Results\n", "print 'Forward Rate constant is %4.2e 1/s'%kA\n", "print 'Backward Rate constant is %4.2e 1/s'%kB\n", "print 'Apperent Rate constant is %4.2e 1/s'%kApp" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Forward Rate constant is 4.34e+08 1/s\n", "Backward Rate constant is 4.34e+04 1/s\n", "Apperent Rate constant is 4.34e+08 1/s\n" ] } ], "prompt_number": 55 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.10, Page Number 480" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import pi\n", "#Variable Declaration\n", "Dh = 7.6e-7 #Diffusion coefficient of Hemoglobin, cm2/s\n", "Do2 = 2.2e-5 #Diffusion coefficient of oxygen, cm2/s\n", "rh = 35. #Radius of Hemoglobin, \u00b0A\n", "ro2 = 2.0 #Radius of Oxygen, \u00b0A\n", "k = 4e7 #Rate constant for binding of O2 to Hemoglobin, 1/(M.s)\n", "NA =6.022e23 #Avagadro Number\n", "#Calculations\n", "DA = Dh + Do2\n", "kd = 4*pi*NA*(rh+ro2)*1e-8*DA\n", "\n", "#Results\n", "print 'Estimated rate %4.1e 1/(M.s) is far grater than experimental value of %4.1e 1/(M.s), \\nhence the reaction is not diffusion controlled'%(kd,k)" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Estimated rate 6.4e+13 1/(M.s) is far grater than experimental value of 4.0e+07 1/(M.s), \n", "hence the reaction is not diffusion controlled\n" ] } ], "prompt_number": 65 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example Problem 18.11, Page Number 484" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from math import log, e\n", "#Variable Declaration\n", "Ea = 104e3 #Activation energy for reaction, J/mol\n", "A = 1.e13 #Pre-exponential factor for reaction, 1/s\n", "T = 300.0 #Temeprature, K\n", "R = 8.314 #Ideal gas constant, J/(mol.K)\n", "h = 6.626e-34 #Plnak constant, Js\n", "c = 1.0 #Std. State concentration, M\n", "k = 1.38e-23 #,J/K\n", "\n", "#Calculations\n", "dH = Ea - 2*R*T\n", "dS = R*log(A*h*c/(k*T*e**2))\n", "\n", "#Results\n", "print 'Forward Rate constant is %4.2e 1/s'%dH\n", "print 'Backward Rate constant is %4.2f 1/s'%dS" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Forward Rate constant is 9.90e+04 1/s\n", "Backward Rate constant is -12.72 1/s\n" ] } ], "prompt_number": 72 } ], "metadata": {} } ] }