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Lecture

tutorial ch 7 june 6.docx

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Department
Chemistry
Course
CHEM 1000
Professor
Hameed A.Mirza
Semester
Summer

Description
1. A 100g coffee sample (specific heat = 0.385 J/gC) at 100C is added to 50.0g of water at 26.5C what is the final T of the mixture? (T in Fahrenheit could be asked)  q coffee qwater= 0  q coffee - water  100g x 0.385J/gC x (X – 100C) = -50g x 4.184T/gC x (X – 26.5C) c C  38.5X c3850J = -209X +55c9J  X c37.9C 2. 10g ice is heated to 60C… what is the total ene involved in this sample? Specific heat of water 4.184 J/gC and enthalpy of fusion = 6.02 KJ/mol Initial temp = -10C. desity of water is 1.00 g/L  -10C – q 1 0C – q wa2er – q  60C 3 3. The heat of combustion of benzoic acid in -26.42 KJ/g. The combustion of 1.176g sample of benzoic acid causes a temp increase of 4.96C in bomb calorimeter. What is the heat capacity of the of the calorimeter assembly?  q rxn= 1.176g x -26.42 KJ/g = -31.07 KJ = - q cal  q cal x ∆T  so, c = 6.26 KJ/C  Aqueous silver ion reacts with aqueous chloride ion to yield a white precipitate of silver chloride. + - Ag + cl agcl When 10.0 ml of 1.00 M AgNo is ad3ed to 10.0 ml of 1.00 M Nacl solution at 25C in a calorimeter a white precipitate of Agcl forms and the temperature of the aqueous mixture increases to 32.6C Assuming the specific heat of the aqueous mixture is 4.18 J/gC the densit
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