CHEM 1310 Chapter Notes - Chapter Calorimetry : Enthalpy, Negative Number, Hne

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plumgoat195

7 Sep 2018

School

University of Manitoba

Department

Chemistry

Course

CHEM 1310

Professor

John M.Cullen

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Document Summary

The purpose of the calorimetry experiment is to calibrate and calculate the heat capacity of the calorimeter and to measure the heat ow of the reaction (enthalpy) using a constant-pressure calorimeter. The following equation was used to determine the heat capacities nca. Average (ccal) ( 56. 96j 1) + ( 38. 79j 1) + ( 18. 30j 1) The following equations will be used to determine. 71 g + 10. 42 g = 111. 13 g. T = 27. 90 23. 30 = . Q = ( 111. 13 g) (3. 96 jg 1 1 )( 4. 6 ) = 2024. 34 j. Molar mass of the anhydrous salt is 82. 0338 [1] H1 dissolution = 15. 94 x103 j m ole 1 15. 94 k j m ole 1. Mass of mixture = 100. 63 g + 10. 23 g = 110. 86 g [1] T = 20. 30 22. 50 = 2. 2 . Q = ( 110. 86 g) (3. 96 jg 1 1 )( 2. 2 ) = 965 .

Related Questions

Part 1:

A calorimeter contains 17.0mL of water at 15.0 ?C. When 1.30g of X (a substance with a molar mass of 44.0g/mol) is added, it dissolves via the reaction

X(s)+H 2 O(l)?X(aq)

and the temperature of the solution increases to 27.0 ?C

Calculate the enthalpy change, delta H , for this reaction per mole of X

Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g*C) ], that density of water is 1.00 g/ml , and that no heat is lost to the calorimeter itself, nor to the surroundings

Express the change in enthalpy in kilojoules per mole to three significant figures.

Part 2:

Consider the reaction

C 12 H 22 O 11 (s)+12O 2 (g)?12CO 2 (g)+11H 2 O(l)

in which 10.0 g of sucrose, C12H22O11 was burned in a bomb calorimeter with a heat capacity of 7.50 kJ/C. The temperature increase inside the calorimeter was found to be 22.0 C. Calculate the change in internal energy, delta E, for this reaction per mole of sucrose.

Express the change in internal energy in kilojoules per mole to three significant figures.

C 12

CHEM 1310 Chapter Notes - Chapter Calorimetry : Enthalpy, Negative Number, Hne

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