University:
Colgate University
Course:
CHEM 101 | General Chemistry I
Academic year:

2023
Views:

310

Pages:

14
Author:

Origbo2ol

Experiment 25 Calorimetry Formal Lab Report: Experiment 25 Calorimetry Experiment 25 Calorimetry 2 Abstract The main purpose of the Calorimetry experiment is to measure the enthalpy, specific heat capacity, of substances using a calorimeter. Within physical reactions there is a transfer of heat that can be released as an exothermic reaction, or absorbed as an endothermic reaction. The major results for the three quantitative measurements include the average heat energy (AT) within the substances. The specific heat of a metal is the energy needed to change one gram of unknown metal A by 1°C. The average specific heat of unknown metal A is 55.81 J/g °C. The acid-base reaction is an exothermic reaction that produces heat, and H2O. The average AT in the acid-base reaction was 2487.1 J or 2.4871 kJ/mol H2O. The dissolution of salt (ammonium nitrate) measures the energy evolved, or absorbed using AHLE (Lattice Energy) and AH (hydration energy). The final results for the average AT for the dissolution of salt was 12098. J/mol of salt. Experiment 25 Calorimetry 11 Ammonium Nitrate 1. Mass of Salt 5.447 g 5.275 g 2. Moles of Salt 068 mol .066 mol 3. Mass of Calorimeter 33.904 g 33.815 g 4. Mass of Calorimeter + Water 53.865 g 53.873 g 5. Mass of Water 19.96 g 20.06 g 6. Initial Temperature of Water 21.4 deg * C 21.4 deg * C 7. Final Temperature of Mixture from Graph 29.3 deg * C 29.6 deg * C Calculations for Enthalpy (Heat) of Solution for the Dissolution of Salt TRIAL 1 TRIAL 2 1. Temperature Change of Solution Delta*T 9.34 deg * C 9.54 deg * C 2. Heat Change of Water 779.3 J 799.9 J 3. Heat Change of Salt 16.14 J 15.95 J 4. Total Enthalpy Change 795.4 J 815.85 J 5. ΔΗΠ 11942.5 J/mol salt 12254.8 J/mol salt 6. Average Delta*H Box 12098.7 J/mol of salt Experiment 25 Calorimetry 13 Discussion In this experiment, we are measuring the average amount of heat energy that is expressed throughout the experiment. For my discussion I am going to go over the three different equations from each procedure. The calculations for the average specific metal can be found by following this equation, specific heat = -Specific heatox Μαχιο ΔΤΗ Through this equation I was able to find the average specific metal by plugging the known values into place. This is the equation with the values plugged into place (22.7 * 19.795 * 19.5 deg * C)/(23.497 * 77.5C) this means that the specific heats is equal to 56.12. The next example is the equation was used to solve the Delta*H Box in the acid-base reaction used in the procedure titled Enthalpy (Heat) of Neutralization for an Acid-Base Reaction. The equation is as follows, (enthalpy change) AH-Specific heatH20 combined massesd * Delta*T . The equation was used to find the value of Delta*H Box by plugging in the appropriate numbers - 4.18 * 100 * 6.2 which equals 2591.6 J (2.5916 kJ). The last example was used to calculate the average Delta*H Box of Solution for the Dissolution of a Ammonium Nitrate. The equation used for this procedure is as follows, (-specific heat 10 mала Нго ДТ И₂0) (pecific heat, nutка ППО АТП Once the values were mole filled into the correct place the equation equalled (-4.18*19, 96 * 7.9 +(-1.74*5.447*16,14) .068 which is 11942.5.

Formal Lab Report Experiment 25 Calorimetry

Related Documents

Recommended Documents

Description

Related Documents

Want to Download This Document?

Free up your schedule!

Take 5 seconds to unlock