CHE 110L Lecture Notes - Lecture 9: Junkers J.I, Jmol, Calorimetry

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bluecockroach554

29 Jul 2018

School

Quinnipiac University

Department

Chemistry

Course

CHE 110L

Professor

David Stilwell

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The procedure for this experiment can be found on pages 70-76 in general chemistry. Carbon copies of the data table have been attached to the back of this lab report. Heat of solution calculations: t = tf - ti, 16. 02 c 22. 47 c = -6. 45 c, 14. 62 c 21. 21 c = -6. 59 , q = cm t, (-20. 93g)(4. 184 j/g* c)(-6. 45 c) = 564. 8 j, (-20. 72g)(4. 184 j/g* c)(-6. 59 c) = 571. 3 j, moles of nh4no3. 80. 04g/mol = 0. 02530 mol: h solution = q reaction moles of nh4no3. 571. 3: h solution (kj, 22316. 6 j/mol , 22581. 2 j/mol * The purpose of this lab was to develop an understanding of temperature, heat, heat capacity, and specific heat. Calorimetry was used to determine the specific heat of an unknown metal and to measure the heat of solution of an ammonium salt. The unknown metal number was found to be 9. The specific heat of the metal was found to be.

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INSTRUCTOR:

DATE:

SECTION/GROUP PRE-LABORATORY QUESTIONS THERMOCHEMISTRY: ACID-BASE NEUTRALIZATION I.

Consider this coffee cup calorimetry experiment:

a. of water at was poured into of water at in a coffee cup. Calculate the heat capacity of the calorimeter, and the temperature of the contents of the calorimeter equilibrated to before beginning to fall to room temperature. (The density and specific heat of water or any aqueous solution can be assumed to be and , respectively)

b. To the calorimeter, of acetic acid was added to of at and the temperature of the solution equilibrated to . Calculate an enthalpy of neutralization for acetic acid, using the calculated heat capacity of the coffee cup.

tealmacaw743

A 28.4 g sample of C2H5OH is burned in a calorimetry containing1.0 kg water. The temperature of the calorimetry and its contentsrose from 25.00 Celcius to 29.71 Celsius.

SpH(H2O) = 4.184 J/gCelsius C(calorimetry)= 5.3 J/Celsius

Determine the heat involved in the combustion of 1.0 mole ofC2H5OH

CHE 110L Lecture Notes - Lecture 9: Junkers J.I, Jmol, Calorimetry

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