1. Thermodynamics is the study of heat transfer and temperature changes in chemical reactions and physical changes of matter.
2. The first law of thermodynamics states that energy is conserved in the universe and cannot be created or destroyed.
3. Calorimetry involves measuring heat changes that occur during chemical reactions using a calorimeter. Exothermic reactions release heat while endothermic reactions absorb heat.
The fundamentals of chemical equilibrium including Le Chatier's Principle and solved problems for heterogeneous and homogeneous equilibrium.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Topic Contains:
What is Thermo Chemistry ?
Define Origin of Heat of Reaction..
Exothermic Reaction..
Endothermic Reaction..
Graphical representation of Exothermic
and Endothermic reactions..
Different type of heat reactions..
Hess’s law..
The fundamentals of chemical equilibrium including Le Chatier's Principle and solved problems for heterogeneous and homogeneous equilibrium.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Topic Contains:
What is Thermo Chemistry ?
Define Origin of Heat of Reaction..
Exothermic Reaction..
Endothermic Reaction..
Graphical representation of Exothermic
and Endothermic reactions..
Different type of heat reactions..
Hess’s law..
The chemical energy of a system is changed as a result of a reaction. Calorimetry. Heat of combustion . Calculation of caloric content of sucrose or food. Combustion reaction.
1. Understand that Energy is exchanged or transformed in all chemical reactions and physical changes of matter. As a basis for understanding this concept: (a) Students know how to describe temperature and heat flow in terms of the motion of molecules (or atoms) and (b) Students know chemical processes can either release (exothermic) or absorb (endothermic) thermal energy.
Discusses macroscopic and microscopic properties of solids and liquids.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
4. THERMODYNAMICS Why study thermodynamics? 1. All chemical reactions result in heat transfer 2. Understanding heat transfer properties is important for building materials 3. Food is evaluated by the amount of energy it releases
5. THERMODYNAMICS Heat – the transfer of energy due to contact Thermal energy – the energy of an object directly related to temperature Temperature – measure of internal energy of an object due to particle motion (kinetic energy)
6. THERMODYNAMICS FIRST LAW OF THERMODYNAMICS The total amount of energy in the universe is constant (conservation of energy). Energy is not created or destroyed.
7. THERMODYNAMICS Different types of matter require different amounts of heat transfer to change the same amount of temperature. If provided the same amount of heat, which substance will feel the hottest? Water is unusual in that it can absorb and release a lot of heat without the temperature changing drastically.
9. THERMODYNAMICS Specific Heat Capacity – the amount of heat transfer required to change the temperature of one gram of a substance one degree Celsius or Kelvin c = q / m Δ T Specific heat capacity (J/(g·ºC) Quantity of heat transferred (J) Mass (g) Temperature (ºC) Normally, you see the formula written as such: q = mc Δ T
10. THERMODYNAMICS Heat Capacity – The amount of energy required to raise the temperature of a sample by one degree Celsius or Kelvin. The units are J/°C. Heat capacity can also be given for a specific quantity of substance (i.e. 100g). The units are J
11. THERMODYNAMICS Heat Capacity – the amount of heat transfer required to change the temperature of one gram of a substance one degree Celsius or Kelvin c = q / Δ T Specific heat capacity (J/(g·ºC) Quantity of heat transferred (J) Temperature (ºC) Normally, you see the formula written as such: q = c Δ T Notice how the formula is almost identical to the previous formula, except it does not have mass (m)
12. THERMODYNAMICS Example 1: If a gold ring with a mass of 5.5 g changes in temperature from 25.0°C to 28.0°C, how much heat energy, in Joules, has it absorbed? The value of the specific heat capacity of gold is 0.129 J/(g·ºC) . Given: m = 5.5g Δ T = 28.0ºC – 25.0ºC = 3.0ºC c = 0.129 J/(g·ºC) c = q / m Δ T q = mc Δ T = (5.5g) x (0.129 J/g·ºC) x (3.0ºC) = 2.1285 J = 2.1 J Therefore the amount of heat absorbed is 2.1 J
13. THERMODYNAMICS Example 2: What would be the final temperature if 250.0 J of heat were transferred into 10.0g of methanol (c = 2.9 J / g • °C) initially at 20 °C? Given: m = 10.0g Δ T = x - 20ºC c = 2.9 J/(g·ºC) c = q / m Δ T Δ T = q / mc = 250.0 J / 10.0g x 2.9 J/g·ºC = 8.62 ºC Therefore the final temperature is 29ºC Δ T = x - 20 ºC 8.62ºC = x - 20ºC = 28.62ºC = 29ºc
14. THERMODYNAMICS Example 3: The temperature of a 250g sample of water is changed from 25.0°C to 30.0°C. How much energy was transferred into the water to cause this change? Calculate your answer in J, kJ, calories, and kilocalories. The heat capacity of water is 4.2J/g∙°G Let’s analyze the question… You’re solving for q, but you don’t know the following: What is a kJ? What is a calorie? What is a kilocalorie? 1kJ =1000J 1cal =4.2J 1kcal =4200J or 4.2kJ A calorie is the specific amount of heat required to raise the temperature of 1g of water by 1°C.
15. THERMODYNAMICS Example 3: The temperature of a 250g sample of water is changed from 25.0°C to 30.0°C. How much energy was transferred into the water to cause this change? Calculate your answer in J, kJ, calories, and kilocalories. The heat capacity of water is 4.2J/g∙°G Given: m = 250g Δ T = 30.0 ºC – 25.0ºC = 5°C c = 4.2 J/g·ºC q = mc Δ T = (250g) x (4.2 J/g·ºC) x (5°C) = 5250J = 5250 J = 5.25 kJ = 1.25 kcal = 1250 cal Therefore the energy transferred into the water is 5.2x10 3 J, 5.2kJ, 1.2kcal, and 1.2x10 3 cal
16. THERMODYNAMICS Calorimetry - the measure of heat change due to a chemical reaction Chemical reaction occurs inside
17. THERMODYNAMICS Calorimetry System – all objects that are being studied (usually the chemical reaction) systems typically are defined by boundaries Surroundings – all objects that are not the system
18. THERMODYNAMICS Calorimetry Open system - heat and matter may be transferred between the system and the surroundings Where is the system in the picture?
19. THERMODYNAMICS Calorimetry Closed system - no matter transfer occurs between the system and the surroundings Heat may transfer between system and surroundings
21. THERMODYNAMICS Calorimetry Bomb calorimeter - reaction chamber allows heat transfer to the surrounding water, all contained within an insulated container
23. THERMODYNAMICS Calorimetry Exothermic reaction – Reaction where the system releases heat to the surroundings - ALL calculations involving these reactions will have a negative answer Endothermic reaction – Reaction where the system absorbs heat from the surroundings - ALL calculations involving these reactions will have a positive answer
24. THERMODYNAMICS Calorimetry Let’s analyze the question… Normally, we solve for the total change in heat. This time, we solve for the same thing, but PER MOLE. So we simply use the specific heat formula to solve for q, and divide the answer by the number of moles (n) q = c Δ T Then, divide q by n q n Example 4: When 1.02g of steric acid, C 18 H 36 O 2 , was burned completely in a bomb calorimeter, the temperature of the calorimeter rose by 4.26°C. The heat capacity of the calorimeter was 9.43 kJ/°C. Calculate the total heat of combustion of steric acid in kJ / mol. Is this heat capacity or specific heat cpacity? # of moles
25. THERMODYNAMICS Calorimetry Example 4: When 1.02g of steric acid, C 18 H 36 O 2 , was burned completely in a bomb calorimeter, the temperature of the calorimeter rose by 4.26°C. The heat capacity of the calorimeter was 9.43 kJ/°C. Calculate the total heat of combustion of steric acid in kJ / mol. Given: m = 1.02g n = m/M = 1.02g / (12.011 x 18 + 1.008 x 36 + 16.00 x 2)g/mol = 1.02g / 284.486g/mol = 0.003585414 mol Δ T = 4.26ºC c = 9.43 kJ/ºC Because this question is asking for q per mole Why do we need to solve for moles?
26. THERMODYNAMICS Calorimetry Given: m = 1.02g n = 0.003585414 mol Δ T = 4.26ºC c = 9.43 kJ/ºC q = c Δ T = (9.43 kJ/ºC) x (4.26ºC) = 40.1718kJ q = 40.1718kJ n 0.003585414mol = 11204.23 kJ/mol Example 4: When 1.02g of steric acid, C 18 H 36 O 2 , was burned completely in a bomb calorimeter, the temperature of the calorimeter rose by 4.26°C. The heat capacity of the calorimeter was 9.43 kJ/°C. Calculate the total heat of combustion of steric acid in kJ / mol.
27. THERMODYNAMICS Calorimetry Given: m = 1.02g n = 0.003585414 mol Δ T = 4.26ºC c = 9.43 kJ/ºC q = 11204.23 kJ/mol Example 5: When 1.02g of steric acid, C 18 H 36 O 2 , was burned completely in a bomb calorimeter, the temperature of the calorimeter rose by 4.26°C. The heat capacity of the calorimeter was 9.43 kJ/°C. Calculate the total heat of combustion of steric acid in kJ / mol. Don’t forget scientific notation and significant digits! = 1.12 x 10 4 kJ/mol Therefore the total heat of combustion is -1.12 x 10 4 kJ/mol Don’t forget that this is an exothermic reaction! = - 1.12 x 10 4 kJ/mol
28. THERMODYNAMICS Calorimetry Example 5: 175g of water was placed in a coffee cup calorimeter and chilled to 10°C. Then 4.90 g of sulfuric acid was added at 10°C and the mixture was stirred. The temperature rose to 14.9°C. Assume the specific heat capacity of the solution is 4.2 J/g •°C. Calculate the heat produced in kJ and the heat produced per mole of sulfuric acid. Let’s analyze the question… You’re given the mass of water and sulfuric acid. Since both are placed in the calorimeter to form the “solution”, then their masses must be added together. m = 175g + 4.90g = 179.9g H 2 O + H 2 SO 4
29. THERMODYNAMICS Calorimetry Example 5: 175g of water was placed in a coffee cup calorimeter and chilled to 10°C. Then 4.90 g of sulfuric acid was added at 10°C and the mixture was stirred. The temperature rose to 14.9°C. Assume the specific heat capacity of the solution is 4.2 J/g •°C. Calculate the heat produced in kJ and the heat produced per mole of sulfuric acid. Let’s analyze the question a bit more… The question is asking for q, but also q per mole. What “mole” is it referring to? It’s asking for q per mole of H 2 SO 4 . So you must solve for the moles of H 2 SO 4 .
30. THERMODYNAMICS Calorimetry Example 5: 175g of water was placed in a coffee cup calorimeter and chilled to 10°C. Then 4.90 g of sulfuric acid was added at 10°C and the mixture was stirred. The temperature rose to 14.9°C. Assume the specific heat capacity of the solution is 4.2 J/g •°C. Calculate the heat produced in kJ and the heat produced per mole of sulfuric acid. Given: m = 179.9g n = m/M = 4.90g / (1.008 x 2 + 32.065 x 1 + 16.00 x 4)g/mol = 4.90g / 98.081g/mol = 0.049958708 mol Δ T = 14.9ºC - 10ºC = 4.9ºC c = 4.2 J/g·ºC
31. THERMODYNAMICS Calorimetry Example 5: 175g of water was placed in a coffee cup calorimeter and chilled to 10°C. Then 4.90 g of sulfuric acid was added at 10°C and the mixture was stirred. The temperature rose to 14.9°C. Assume the specific heat capacity of the solution is 4.2 J/g •°C. Calculate the heat produced in kJ and the heat produced per mole of sulfuric acid. Given: m = 179.9g n = 0.049958708 mol Δ T = 4.9ºC c = 4.2 J/g·ºC q = mc Δ T = (179.9g) x (4.2 J/g·ºC) x (4.9ºC) = 3702.342 J q = 3702.342 J n 0.049958708mol = 74108.04138 J/mol = 74 kJ/mol This is your first answer! This is your second answer!
32. THERMODYNAMICS Calorimetry Example 5: 175g of water was placed in a coffee cup calorimeter and chilled to 10°C. Then 4.90 g of sulfuric acid was added at 10°C and the mixture was stirred. The temperature rose to 14.9°C. Assume the specific heat capacity of the solution is 4.2 J/g •°C. Calculate the heat produced in kJ and the heat produced per mole of sulfuric acid. Given: m = 179.9g n = 0.049958708 mol Δ T = 4.9ºC c = 4.2 J/g·ºC q = 3702.342 J = 3.7kJ q = 74kJ/mol n Therefore the heat produced is -3.7kJ and the heat produced per mole of sulfuric acid is -74kJ/mol Remember that this is an exothermic reaction!!
33. THERMODYNAMICS Calorimetry Example 6: The reaction of HCl and NaOH is exothermic. A student placed 50.0 mL of 1.00 M HCl at 25.5°C in a coffee cup calorimeter and then added 50.0 mL of 1.00 M NaOH also at 25.5°C. The mixture was stirred and the temperature quickly increased to 32.4°C. What is the heat of the reaction in J/mol of HCl? The heat capacity of H 2 O is 4.2 J/g•°C. , and its density is 1.00g/mL. Let’s analyze the question… The reaction that occurs is HCl (aq) + NaOH (aq) H 2 O (l) + NaCl (aq) + energy Since we have equal volumes of both, then the total volume is 100.0mL. With a density of 1.00g/mL, the mass of the water is 100.0g. Once again, we are solving for q, but per mole.
34. THERMODYNAMICS Calorimetry Example 6: The reaction of HCl and NaOH is exothermic. A student placed 50.0 mL of 1.00 M HCl at 25.5°C in a coffee cup calorimeter and then added 50.0 mL of 1.00 M NaOH also at 25.5°C. The mixture was stirred and the temperature quickly increased to 32.4°C. What is the heat of the reaction in J/mol of HCl? The heat capacity of H 2 O is 4.2 J/g•°C, and its density is 1.00g/mL. Given: m = 100.0g c = 4.2 J/g•°C Δ T = 32.4°C-25.5°C = 6.9°C n HCl = CV = 1.00M x 0.0500L = 0.0500mol Remember to convert mL to litres
35. THERMODYNAMICS Calorimetry Example 6: The reaction of HCl and NaOH is exothermic. A student placed 50.0 mL of 1.00 M HCl at 25.5°C in a coffee cup calorimeter and then added 50.0 mL of 1.00 M NaOH also at 25.5°C. The mixture was stirred and the temperature quickly increased to 32.4°C. What is the heat of the reaction in J/mol of HCl? The heat capacity of H 2 O is 4.2 J/g•°C, and its density is 1.00g/mL. Given: m = 100.0g c = 4.2 J/g•°C Δ T = 6.9°C n HCl = 0.0500mol q = mc Δ T = (100.0g) x (4.2 J/g·ºC) x (6.9ºC) = 2898J q = 2898J n 0.0500mol = 57960J/mol = -5.8x10 4 J/mol Therefore the heat of the reaction is - 5.8x10 4 J/mol of HCl
36. THERMODYNAMICS Calorimetry Example 7: A sample of 2.65 g of carbon in the form of graphite was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 22.25 o C to 30.55 o C. The calorimeter itself is made of 3.000 kg of lead (c lead= 300 J/g o C) and contains 2000.0 mL of water (4.18 J/ g o C). Determine the molar enthalpy of this sample of carbon’s combustion. Let’s analyze the question… What are the two components of the calorimeter? How does this affect the heat capacity of the calorimeter?
37. THERMODYNAMICS Calorimetry Example 7: A sample of 2.65 g of carbon in the form of graphite was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 22.25 º C to 30.55 º C. The calorimeter itself is made of 3.000 kg of lead (c lead= 300 J/g o C) and contains 2000.0 mL of water (4.18 J/ g o C). Determine the molar enthalpy of this sample of carbon’s combustion. Given: Δ T = 30.55ºC – 22.25ºC = 8.3ºC m calorimeter = 3000.g + 2000.0g = 5000.g m% of the calorimeter: 60% lead, 40% water c calorimeter = 60% x 300J/gºC + 40% x 4.18J/gºC = 181.672J/gºC OR c calorimeter = 3000.g x 300J/gºC + 2000.0g x 4.18J/gºC = 908360J/ºC specific heat capacity heat capacity
38. THERMODYNAMICS Calorimetry Example 7: A sample of 2.65 g of carbon in the form of graphite was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 22.25 º C to 30.55 º C. The calorimeter itself is made of 3.000 kg of lead (c lead= 300 J/g o C) and contains 2000.0 mL of water (4.18 J/ g o C). Determine the molar enthalpy of this sample of carbon’s combustion. Given: Δ T = 8.3ºC m calorimeter = 5000.g C calorimeter = 908360J/ºC n = m/M = 2.65g / 12.011g/mol = 0.220631088mol
39. THERMODYNAMICS Calorimetry Example 7: A sample of 2.65 g of carbon in the form of graphite was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 22.25 º C to 30.55 º C. The calorimeter itself is made of 3.000 kg of lead (c lead= 300 J/g o C) and contains 2000.0 mL of water (4.18 J/ g o C). Determine the molar enthalpy of this sample of carbon’s combustion. Given: Δ T = 8.3ºC c calorimeter = 908360J/ºC n=0.220631088mol q = c Δ T = (908360J/ºC) x (8.3ºC) = 7539388 J q = 7539388 J n 0.220631088mol = 34171920.5J/mol = -3.42x10 4 KJ/mol Therefore the molar enthalpy is -3.42x10 4 kJ/mol
40. THERMODYNAMICS Calorimetry Example 8: How much water at 100.0 ºC must be added to 80.0 g of water at 25.0 ºC to give a final temperature of 85.0 ºC? (3 marks; T/I) Given: T f = 85ºC T 1 = 25ºC, m 1 =80.0g T 2 = 100ºC, m 2 = x 80.0 x 25ºC + x x 100ºC = 85ºC 80.0+ x 80.0+ x 2000 + 100 x = 6800 + 85 x 15 x = 4800 x = 320g Therefore 320g of water must be added