A 11.00 g sample of Compound X (Molar mass = 137.6 g/mol) was burned in a bomb calorimeter (constant volume calorimeter) containing 0.650 kg of water. The temperature of the water in the calorimeter rose from 24.00°C to 26.32°C. Calculate the ∆Hcombustion of Compound X in kJ/mol. The heat capacity of the calorimeter is 337 J/oC and the specific heat capacity of water is 4.184 J/(goC).
A 11.00 g sample of Compound X (Molar mass = 137.6 g/mol) was burned in a bomb calorimeter (constant volume calorimeter) containing 0.650 kg of water. The temperature of the water in the calorimeter rose from 24.00°C to 26.32°C. Calculate the ∆Hcombustion of Compound X in kJ/mol. The heat capacity of the calorimeter is 337 J/oC and the specific heat capacity of water is 4.184 J/(goC).
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
- A 11.00 g sample of Compound X (Molar mass = 137.6 g/mol) was burned in a bomb calorimeter (constant volume calorimeter) containing 0.650 kg of water. The temperature of the water in the calorimeter rose from 24.00°C to 26.32°C. Calculate the ∆Hcombustion of Compound X in kJ/mol. The heat capacity of the calorimeter is 337 J/oC and the specific heat capacity of water is 4.184 J/(goC).
Transcribed Image Text:This image depicts a graph illustrating the relationship between heating time and temperature.
**Graph Explanation:**
- **Axes:**
- The x-axis represents "Heating Time," indicating the progression of time during which the substance is heated.
- The y-axis represents "Temperature" in degrees Celsius (°C).
- **Data Points:**
- The graph shows a series of plateau and incline sections labeled from 1 to 5.
- At point 1, the temperature starts at 5.0 °C.
- There is a plateau between points 2 and 3, suggesting no change in temperature despite heating.
- At point 3, the temperature increases to 15.0 °C.
- A second plateau occurs between points 4 and 5.
**Concepts:**
- The plateaus indicate periods where the substance remains at a constant temperature, possibly representing phase changes where energy is used to change the state rather than increasing temperature.
- The incline sections represent periods of sensible heat where the temperature of the substance rises with time.
This graph is an example of a heating curve, used to describe how temperature changes with constant heating in a scientific or educational setting.
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