 # Bomb Calorimeter Experiment Essay

Great Essays
ABSTRACT
Within this experiment, the use of a bomb calorimeter was required in order to determine the heat capacity of the system through the combustion of three separate trials of benzoic acid. The resulting heat capacity values for each trial were averaged, with a standard deviation found as well. This was then used to work backwards, for a naphthalene trial, in order to calculate the change in energy (∆U) and the change of enthalpy (∆H). The accepted value for the change in enthalpy of naphthalene is equal to -5157 kJ/mol. The computed value from the experiment is equal to -3076 kJ/mol, which means that the percent error in the experiment is equal to 40.35%.
INTRODUCTION

In this laboratory report, the method to calculate the change in energy (∆U) and the change in enthalpy (∆H) of a sample can be seen and followed. This method or procedure rather, is
Through this use, the calorimeter constant can be calculated, as well as the heat capacity of the system of the calorimeter. These various techniques are all put to use to calculate for unknown values that do not appear in a standard table or entry. It is the study of calorimetry that makes it all possible.

Hence, in this experiment, a bomb calorimeter will be used to determine the change in energy and the change in enthalpy of naphthalene. These two values are the goal for the experiment and through the manipulation of the data, they will be achieved. The bomb calorimeter is first used to test three different samples of benzoic acid, in order to settle in on a mean value of the heat capacity of the system, which is then used as a value to solve for the change in energy of naphthalene. After this, the change in enthalpy could be computed and the percent error analyzed for the experiment.

## Related Documents

• Improved Essays

What is a calorimeter? A calorimeter is a device used to measure the amount of heat that is involved in a chemical reaction. This is the device we will be using to determine the amount of heat produced by a chemical process. Another term to know is Enthalpy, as stated in the lab website glossary, Enthalpy, “is the sum of the internal energy of a system and the product of its pressure and volume.” Experimental Procedures: For this experiment there are two parts that need to be completed followed by, Lab Clean-up. The reagents used in part 1 of this experiment are NaOH,…

• 1355 Words
• 5 Pages
Improved Essays
• Superior Essays

A graph of the volume of hydrogen gas produced versus moles of a reagent that is varied will be able to tell you the point in which the stoichiometric balance is achieved and what the limiting reactant is. In this experiment group A used a constant mass of magnesium metal (0.100 g) and varying volumes of 2.00 M hydrochloric acid added from 2.00 mL to 7.00 mL in progressions of 1.00 mL which in total came out to be six distinctive chemical reactions. Group B used the consistent volume of 2.00 M hydrochloric acid (5.00 mL) and changed the mass of the magnesium metal used from 0.070 g to 0.170 g in growths of 0.020 g which resulted in a total of six different chemical reactions as well. The percent yield for magnesium, according to the data, was 107.3% and the percent yield for hydrochloric acid, according to the data, was 96.0%. Overall, the experiment was fairly successful as observed by the percent yields of both…

• 1398 Words
• 6 Pages
Superior Essays
• Improved Essays

Percent drug loading Econazole nitrate nanoparticles were weighed and then dissolved in ethanol to determine the amount of drug in them using Shimadzu 1800 UV (Japan) measured at 271 nm. The percent drug loading was calculated using the following equation: % Drug loading=(Amount of drug in nanoparticles)/( Weight of nanoparticles)×100 2.2.2.4. Determination of particle…

• 1534 Words
• 7 Pages
Improved Essays
• Improved Essays

The gross heat release rate is synthesized with an equation (3) having two separate Wiebe efficiency factors ap and ad in the two Wiebe functions often referred to as double Wiebe function [25, 33]. The direct experimental measurement of heat release rate is difficult. Therefore, a net apparent heat release rate calculated from the experimentally measured pressure-time profile and computationally calculated piston displacement profile along with heat loss to the cylinder wall using equation (1) is applied for validation. The diesel and DME oxidation reaction equations assuming complete…

• 836 Words
• 4 Pages
Improved Essays
• Superior Essays

This problem is important because when new elements and compounds are discovered, scientists can figure out their characteristics They do this using KMT (Kinetic Molecular Theory). KMT states that in the substance as a gas behaves like hard, spherical objects that are always in constant motion with no attraction. The stated information is the staple of multiple gaseous theories. Some examples are frequency of the collisions, the distance between the particles in the container and the gas’s volume, and the temperature of said gas. The behavior of these particles affects their properties.…

• 1765 Words
• 8 Pages
Superior Essays
• Improved Essays

The unreacted oxygen atoms form molecular oxygen. Chlorates decompose to chlorites and chlorine dioxide. The main results obtained in this study are based on the simulations and quantitative data about change in concentration in time. This is one of the nice examples of the use of this technique for solving general and applied chemistry problems that have strong impact on industry and engineering. The same technique was used for the investigation of the explosives and explosive-related compounds, in the work by Mullen and…

• 1761 Words
• 8 Pages
Improved Essays
• Improved Essays

Batch adsorption experiments Adsorption of the Pb2+ ions by the Fe3O4@GMA-AAm nanocomposite was measured from batch adsorption experiments by mixing 10 mg of adsorbent with an aqueous solution containing a predetermined concentration of Pb2+ ions (50 mL). The mixture was shaken at 200 rpm to reach equilibrium. After a specified time, the solid and liquid were separated by external magnet and the concentrations of Pb2+ ions were measured by AAS. To find the optimized pH in adsorption of Pb2+ ions the effect of the pH was studied. The initial pH of the solutions was adjusted in the range of 2.0 –7.0 by adding 0.1N HCl or 0.1N NaOH solution at 25 ◦C.…

• 1394 Words
• 6 Pages
Improved Essays
• Improved Essays

In addition, using the above results, we were able to find the average value of molarity of NaOH by adding to two molarity values and dividing it by two. Hence the .1mol/L average value of molarity of NaOH. The chemical equation of Citric acid reacting with NaOH is : H3C6H5O7(aq) + 3NaOH(aq) -----> 3H20(l)+…

• 1233 Words
• 5 Pages
Improved Essays
• Improved Essays

It can be calculated y subtracting the sum of enthalpies of formation of reactants from the sum of enthalpies of formation of the products. The enthalpy of formation is the ΔHrxn when 1 mole of a compound is formed from its elements in their standard states at 25℃ at 1 atm.2 The change in enthalpy per mole of a reaction was illustrated by part B of the experiment, because the change in enthalpy per mole of HCl or NH4OH was calculated. The standard molar enthalpy of formation was illustrated by part C of this experiment, because the various reactions added up to a reaction that led to the creation of 1 mole MgO from its elements at their standard states. Hence, the ΔHrxn in this reaction represented the enthalpy of…

• 833 Words
• 4 Pages
Improved Essays
• Improved Essays

Introduction: In this experiment, the molar mas of the chemical used for combustion in a lighter will be determined by using several methods. A flask will be filled to its max capacity and then filled with that gas. After that, the ideal gas law will be used to find mm (the molecular mass of a substance). The equation will be changed to mm=gRT/PV instead of the usual PV=nRT. There are several gas laws exhibited in this experiment.…

• 1346 Words
• 6 Pages
Improved Essays