Program Type

Undergraduate

Faculty Advisor

Dr. Subha Pratihar

Document Type

Presentation

Location

Face-to-face

Start Date

25-4-2023 11:25 AM

Abstract

Calorimetry is an aspect of chemistry primarily focused on determining the enthalpy of reactions (∆Hrxn). In the bomb calorimetry technique, the heat of combustion of chemical compounds can be measured experimentally. From this data and the application of Hess’s Law, ∆the Hrxn of several chemical reactions can be determined. The technique of bomb calorimetry can be applied to food, fuels, pharmaceuticals, and many other fields. The objective of the present project is to determine the specific enthalpy of various simple carbohydrates (naturally occurring sugars) through bomb calorimetry and compare it with that of aromatic hydrocarbons.

By performing benzoic acid standardization reactions with the Parr™ Model 1341 Oxygen Combustion Vessel, the calorimeter constant was found to be 10.2717 ± .0565 KJ/°C with a 95% confidence interval, allowing the accurate determination of specific enthalpy for each of the sugars at constant volume in a pure O2 vessel.

As we proceed with the experiment several aromatic hydrocarbons (e.g Naphthalene, etc) and several simple carbohydrates (e.g Sucrose, Glucose, etc.) will be tested to obtain the enthalpy of combustion (∆Hcomb). We will perform quantum chemical calculations on the reactant and product molecules to determine the ∆Hcomb and compare the experimental values with computational data.

COinS
 
Apr 25th, 11:25 AM

A Comparative Study of Specific Enthalpy of Aromatic Hydrocarbons with Simple Carbohydrates

Face-to-face

Calorimetry is an aspect of chemistry primarily focused on determining the enthalpy of reactions (∆Hrxn). In the bomb calorimetry technique, the heat of combustion of chemical compounds can be measured experimentally. From this data and the application of Hess’s Law, ∆the Hrxn of several chemical reactions can be determined. The technique of bomb calorimetry can be applied to food, fuels, pharmaceuticals, and many other fields. The objective of the present project is to determine the specific enthalpy of various simple carbohydrates (naturally occurring sugars) through bomb calorimetry and compare it with that of aromatic hydrocarbons.

By performing benzoic acid standardization reactions with the Parr™ Model 1341 Oxygen Combustion Vessel, the calorimeter constant was found to be 10.2717 ± .0565 KJ/°C with a 95% confidence interval, allowing the accurate determination of specific enthalpy for each of the sugars at constant volume in a pure O2 vessel.

As we proceed with the experiment several aromatic hydrocarbons (e.g Naphthalene, etc) and several simple carbohydrates (e.g Sucrose, Glucose, etc.) will be tested to obtain the enthalpy of combustion (∆Hcomb). We will perform quantum chemical calculations on the reactant and product molecules to determine the ∆Hcomb and compare the experimental values with computational data.