gradient shows that the ln Ksp is inversely proportional to 1/T. The gradient and intercept from the graph is used to calculate the enthalpy and entropy change of the reaction. As demonstrated in the calculations below the change in enthalpy is -31.62 kJ (negative) and the change in entropy is 51.5kJ (positive). Therefore the reaction is spontaneous and the Gibb’s free energy is less than zero‚ pushing the reaction to the right until equilibrium is achieved (Appendix) RT ln Ksp = = Δ H - T Δ S y
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VTT WORKING PAPERS 31 70 60 50 40 30 20 10 0 Gamma Lognormal probability density charring depth l (mm) ESPOO 2005 0 20 40 60 80 0.0 time (min) 0.5 1.0 1.5 2.0 charring rate (m m /m in) A Probabilistic Approach to Wood Charring Rate Jukka Hietaniemi VTT Building and Transport ISBN 951–38–6583–5 (URL: http://www.vtt.fi/inf/pdf/) ISSN 1459–7683 (URL: http://www.vtt.fi/inf/pdf/) Copyright © VTT 2005 JULKAISIJA – UTGIVARE – PUBLISHER
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combustion means that the combustion has taken place under standard conditions‚ s.t.p. Therefore the statement DHq =-286 kJ mol-1 means the enthalpy change of the combustion of hydrogen when one mole of hydrogen is completely burnt in oxygen under standard conditions with reactants and products in their standard states at that temperature. CH4 (g)+2O2 (g) CO2 (g)+ 2H2O(l) DHq= -890 kJ mol-1 meaning that the stored reactants methane and oxygen are higher than the stored energy of the products of the
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lh;kjhlhgfhfkf; j kj kj kj j mkl;k l;k ;lk ;lj;j j;j kjkjkjkjlkjkj j kj j kj kj kj kj Chapter I Rationale of the Study Introduction Social Networking Services‚ also called Social Networking Sites (SNS)‚ are designed to upon interaction‚ to create communities of people online‚ and provide the required software to do this. Web-based social networking spaces offer a way for individuals or groups to create a profile of them‚ then share that profile with other members of social
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(4) C* : C : C = 1 : 1.225 : 1.128 Ans. (3) 39. The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be (R = 8.314 JK–1 mol–1 and log 2 = 0.301) (1) 53.6 kJ mol–1 (2) 48.6 kJ mol–1 (3) 58.5 kJ mol–1 (4) 60.5 kJ mol–1 Ans. (1) Based on the data given above‚ strongest oxidising agent will be : (1) Cl– (2) Cr3+ 2+ (3) Mn (4) MnO4– Ans. (4) 35. A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL
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F UNDAMENTALS OF T HERMODYNAMICS SEVENTH EDITION CLAUS BORGNAKKE RICHARD E. SONNTAG University of Michigan John Wiley & Sons‚ Inc. PUBLISHER ASSOCIATE PUBLISHER ACQUISITIONS EDITOR SENIOR PRODUCTION EDITOR MARKETING MANAGER CREATIVE DIRECTOR DESIGNER PRODUCTION MANAGEMENT SERVICES EDITORIAL ASSISTANT MEDIA EDITOR COVER PHOTO Don Fowley Dan Sayre Michael McDonald Nicole Repasky Christopher Ruel Harry Nolan Hope Miller Aptara® Corporation Inc. Rachael Leblond Lauren Sapira c Corbis Digital
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CHEM 104: General Chemistry II Spring 2014 Exam 1 Version A Instructions: 1. Do NOT open this exam until you are told to do so. Opening the exam before the start of the exam is considered an act of Academic Dishonesty. 2. All answers must be bubbled into the scantron answer sheet. 3. No credit will be given for answers written on this exam. 4. You must use a #2 pencil to bubble in the answers on your scantron. 5. This is a multiple choice exam consisting of 30 questions (7 pages). Each question
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Abstract: This report is a description of an experimental determination of the enthalpy of reaction of sulfuric acid in a reaction with magnesium to produce magnesium sulfate. Through the use of an ice calorimeter‚ the rxn H° D for this reaction is determined to be 1 360kJ mol − − × . Introduction: This report details an experiment in thermochemistry. Included are the methods‚ results‚ and interpretation of results of an experimental determination of an enthalpy of reaction. The reaction
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• The equilibrium law DYNAMIC EQUILIBRIUM forward A +8 reaction ""r=====~’~ reverse reaction Most chemical reactions do not go to completion. Once some products are formed the reverse reaction can take place to reform the reactants. In a closed system the concentrations of all the reactants and products will eventually become constant. Such a system is said to be in a state of dynamic equilibrium. The forward and reverse reactions continue to occur‚ but at equilibrium
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on heating times. Process Parameters The process parameters and initial conditions for Example 1 are given in the table below. (initial bulk liquid temperature) 27.2 C (heat capacity) 2.516 kJ/kg K (mass of bulk liquid in vessel) 329 kg (heat capacity) 1.65 kJ/kg K (initial guess) 257 W/K Jacket flow rate 5 kg/s Model Summary DynoChem provides several utilities for characterizing vessels. These include a template for fitting heat transfer coefficients
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