This document provides a study guide for a chapter 17 thermochemistry exam, including practice problems on thermochemical equations, heat capacities, enthalpy changes, and Hess's law. The problems cover topics like:
- Converting between calories and joules
- Classifying processes as endothermic or exothermic
- Calculating heat required to change temperatures of substances
- Interpreting heating/cooling curves
- Calculating enthalpy changes of phase changes and chemical reactions using standard enthalpy of formation values
- Applying Hess's law to calculate enthalpy changes from multiple reaction steps
Lecture materials for the Introductory Chemistry course for Forensic Scientists, University of Lincoln, UK. See http://forensicchemistry.lincoln.ac.uk/ for more details.
A unique value for a specified state of a system.
Path-Dependent functions.
Enthalpy (โH ) and Internal Energy ( โU) changes in a chemical reaction
Lecture materials for the Introductory Chemistry course for Forensic Scientists, University of Lincoln, UK. See http://forensicchemistry.lincoln.ac.uk/ for more details.
A unique value for a specified state of a system.
Path-Dependent functions.
Enthalpy (โH ) and Internal Energy ( โU) changes in a chemical reaction
What constitutes waste depends on the eye of the beholder; one person's waste can be a resource for another person.[1] Though waste is a physical object, its generation is a physical and psychological process.[1] The definitions used by various agencies are as below.
United Nations Environment Program
According to the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and Their Disposal of 1989, Art. 2(1), "'Wastes' are substance or objects, which are disposed of or are intended to be disposed of or are required to be disposed of by the provisions of national law".[2]
United Nations Statistics Division
The UNSD Glossary of Environment Statistics[3] describes waste as "materials that are not prime products (that is, products produced for the market) for which the generator has no further use in terms of his/her own purposes of production, transformation or consumption, and of which he/she wants to dispose. Wastes may be generated during the extraction of raw materials, the processing of raw materials into intermediate and final products, the consumption of final products, and other human activities. Residuals recycled or reused at the place of generation are excluded."
European Union
Under the Waste Framework Directive 2008/98/EC, Art. 3(1), the European Union defines waste as "an object the holder discards, intends to discard or is required to discard."[4] For a more structural description of the Waste Directive, see the European Commission's summary.
Types of Waste
Municipal Waste
The Organization for Economic Co-operation and Development also known as OECD defines municipal solid waste (MSW) as โwaste collected and treated by or for municipalitiesโ. [5] Typically this type of waste includes household waste, commercial waste, and demolition or construction waste. In 2018, the Environmental Protection Agency concluded that 292.4 tons of municipal waste was generated which equated to about 4.9 pounds per day per person. Out of the 292.4 tons, approximately 69 million tons were recycled, and 25 million tons were composted. [6]
Household Waste and Commercial Waste
Household waste more commonly known as trash or garbage are items that are typically thrown away daily from ordinary households. Items often included in this category include product packaging, yard waste, clothing, food scraps, appliance, paints, and batteries.[7] Most of the items that are collected by municipalities end up in landfills across the world. In the United States, it is estimated that 11.3 million tons of textile waste is generated. On an individual level, it is estimated that the average American throws away 81.5 pounds of clothes each year.[8] As online shopping becomes more prevalent, items such as cardboard, bubble wrap, shipping envelopes are ending up in landfills across the United States. The EPA has estimated that approximately 10.1 million tons of plastic containers and packaging ended up landfills in 2018. The EPA noted that only 30.
Module 7 - Energy Balance chemical process calculationsbalaaguywithagang1
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Chemical process calculations involve various computations and analyses to design, optimize, and understand chemical processes. Here are some descriptions highlighting different aspects of chemical process calculations:
Material Balances:
Material balances are the cornerstone of chemical process calculations, ensuring that the amounts of all components entering and leaving a system are properly accounted for.
These calculations involve tracking the flow rates and compositions of substances throughout a process, often using mass or mole balances.
Energy Balances:
Energy balances involve quantifying the energy inputs and outputs in a chemical process.
These calculations are crucial for understanding the heat transfer requirements, evaluating energy efficiency, and optimizing process conditions.
Reaction Kinetics:
Chemical reactions kinetics calculations focus on understanding the rates at which reactions occur and how they are influenced by various factors such as temperature, pressure, and catalysts.
These calculations help in determining the optimal reaction conditions and designing reactors for desired conversion rates.
Phase Equilibrium Calculations:
Phase equilibrium calculations deal with determining the distribution of components between different phases in a system, such as liquid-liquid or vapor-liquid equilibrium.
These calculations are essential for designing separation processes like distillation, extraction, and absorption.
Thermodynamic Calculations:
Thermodynamic calculations involve applying thermodynamic principles to predict the behavior of chemical systems.
These calculations include determining properties such as enthalpy, entropy, Gibbs free energy, and fugacity, which are crucial for process design and optimization.
Process Simulation:
Process simulation involves using computer software to model and simulate chemical processes.
These simulations allow engineers to predict process behavior under different operating conditions, optimize process parameters, and troubleshoot potential issues.
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A Memorandum of Association (MOA) is a legal document that outlines the fundamental principles and objectives upon which a company operates. It serves as the company's charter or constitution and defines the scope of its activities. Here's a detailed note on the MOA:
Contents of Memorandum of Association:
Name Clause: This clause states the name of the company, which should end with words like "Limited" or "Ltd." for a public limited company and "Private Limited" or "Pvt. Ltd." for a private limited company.
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Registered Office Clause: It specifies the location where the company's registered office is situated. This office is where all official communications and notices are sent.
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Association Clause: It simply states that the subscribers wish to form a company and agree to become members of it, in accordance with the terms of the MOA.
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Legal Requirement: The MOA is a legal requirement for the formation of a company. It must be filed with the Registrar of Companies during the incorporation process.
Constitutional Document: It serves as the company's constitutional document, defining its scope, powers, and limitations.
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External Communication: It provides clarity to external parties, such as investors, creditors, and regulatory authorities, regarding the company's objectives and powers.
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Binding Authority: The company and its members are bound by the provisions of the MOA. Any action taken beyond its scope may be considered ultra vires (beyond the powers) of the company and therefore void.
Amendment of MOA:
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1. Chapter 17 Thermochemistry Study
Guide
17.1 โ 17.2 Thermochemical Equations
Honors Chemistry
1. Make the following conversions:
a. 444 cal to joules = 1.86 x 103 J
b. 1.8 kJ to joules = 1.8 x 103 J
c. 0.45 kJ to calories = 1.1 x 102 cal
2. Classify each of these processes as endothermic or exothermic:
a. condensing steam โ exo c. evaporating alcohol โ endo
b. burning alcohol โ exo d. baking a potato โ endo
3. The specific heat capacity for silver is 0.24 J/goC. Calculate the energy required to
raise the temperature of 150.0 g Ag from 273 K to 298 K. Calculate the molar heat
capacity of silver.
Energy: q = (150.0)(.24)(298-273) = 9.0 x 102 J
Molar heat capacity: (0.24 J/goC)(107.87 g/mol Ag) = 26 J/mol
4. It takes 585 J of energy to raise the temperature of 125.6 g Hg from 20.0oC to
53.5oC. Calculate the specific heat capacity and the molar heat capacity of Hg.
Specific heat capacity: C = q/mฮt = 585/(125.6)(53.5-20) = 0.139 J/goC
Molar heat capacity: (0.139 J/goC)(200.59 g/mol Hg) = 27.9 J/mol
5. A 46.2-g sample of copper is heated to 95.4oC and then placed in a calorimeter
containing 75.0 g water at 19.6oC. The equilibrium temperature in the calorimeter
is 21.8oC. Calculate the specific heat capacity of copper; assuming that all the
heat lost by the copper is gained by the water.
C = 0.203 J/goC
6. A 15.0-g sample of nickel metal is heated to 100.0oC and dropped into 55.0 g of
water, initially at 23.0oC. Assuming that all the heat lost by the nickel is absorbed
by the water; calculate the final temperature of the nickel and the water. The
specific heat of nickel is 0.444 J/goC.
โ15.0(.444)( Tf โ 100.0) = 55.0(4.184)(Tf โ 23.0)
โ 6.66Tf + 666 = 230.12Tf โ 5292.76
5958.76 = 236.78 Tf
25.2oC = Tf
7. Chloe was running bath water and realized it was too hot. If she has 20.0 L of
water in the tub at 95oC and then adds 15.8 L of water at 75oC, what will the final
temperature of the water be?
โ20(Tf โ 95) = 15.8(Tf โ 75)
โ20Tf + 1900 = 15.8 Tf โ 1185
3085 = 35.8 Tf
2. 86.2 oC = Tf
8. For the combustion of methane, calculate the enthalpy change for the burning of
10.00 g of methane.
CH4(g)+ 2O2(g) CO2(g) + 2H2O(l) + 890 kJ
1molCH 4 890 kJ
H 10 .00 gCH 4
16 .05 gCH 4 1molCH 4
ฮH = - 555 kJ
17.3 Heat in Changes of State
9. Read heating curves (See Changes of State w/s) Label the phases, boiling point
and melting point here:
boiling point = 20oC , melting point = 10oC
a = solid
b = melting
c = liquid
d = boiling
e = gas
Indicate whether a heating curve would
be flat or rising in 10-14.
10. liquid is boiling - 13. PE is increasing โ flat
flat
11. solid is warming โ 14. KE is increasing โ
rising rising
Heat of Fusion and Heat of 12. solid is melting โ
Vaporization Problems flat
Values for Water: (SHOW YOUR WORK FOR FULL CREDIT!!)
Hfus = 6.02 kJ/mol Hvap = 40.7 kJ/mol
o
CH2O(s) = 2.03 J/g C CH2O(l) = 4.184 J/g C CH2O(g) = 2.02 J/goC
o
15. How much heat needs to be added to 10090 grams of ice at -10.0oC so that it
all becomes a vapor at 120.0oC?
A q = mCฮT = (10090g)(2.03 J/goC)(0-(-10.0)) = 204827 J
B ฮH =
10090 g H 2 O 1 mol H 2 O 6.02 kJ 1000 J
= 3370799.1 J
1 18.02 g H 2 O 1 mol H 2 O 1kJ
C q = mCฮT = (10090g)(4.184 J/goC)(100-0) = 4221656 J
D ฮH =
10090 g H 2 O 1 mol H 2 O 40 .7 kJ 1000 J
= 22789289.7 J
1 18.02 g H 2 O 1 mol H 2 O 1kJ
E q = mCฮT = (10090g)(2.02 J/goC)(120-100) = 407636 J
3. A + B + C + D + E = 30994207.8 J = 3.10 x 107 J
16. If you are freezing special green ice cubes for St. Patrickโs Day, how much
energy do you need to remove from 2 ice trays of 12 cubes if each cube
holds 24.2 grams of water at 0oC?
194 kJ
17. Anand has a cold and wants to make steam in a vaporizer to help clear his
congestion. How much energy will be required to change one gallon of water
at 100oC to steam at 100oC? (The density of water is 1.00g/ml)
8547 kJ (no sig figs specified)
18. Chelseaโs prom dress is all wrinkled, but she doesnโt have the time or
patience to iron it. How much energy will be required to fire up the steamer to
remove wrinkles if she add 521 grams of water at 25.0oC and changes it all to
steam at 100.oC?
C q = mCฮT = (521g)(4.184 J/goC)(100-25) = 163489.8 J
D ฮH =
521 g H 2 O 1 mol H 2 O 40 .7 kJ 1000 J
= 1176731.41 J
1 18.02 g H 2 O 1 mol H 2 O 1kJ
C + D = 1340221.21 J = 1.34 x 106 J
19. The steamer Andrew is using to strip the NASCAR wallpaper off his bedroom
walls has used 32,967 kJ of energy. How many grams of water at 100 oC has
he changed to steam at 100oC?
14596 g
20. Using a coffee cup calorimeter, Abby finds a balance that works and adds
1.60 g of NH4NO3 to 75.0 g of water at an initial temperature of 25.00oC.
After the salt completely dissolves, the final temperature of the solution is
23.34oC. Assuming no heat is lost to the calorimeter; calculate the enthalpy
change for the dissolution of NH4NO3 in kJ/mol.
ฮH = 26.6 kJ/mol
17.4 Hessโs Law and Standard Enthalpies of Formation
21. Given the following data:
H2(g) + ยฝ O2(g) โ H2O(l) ฮH = -285.8 kJ
N2O5(g) + H2O(l) โ 2HNO3(l) ฮH = -76.6 kJ
ยฝ N2(g) + 3/2 O2(g) + ยฝ H2(g) โ HNO3(l) ฮH = -174.1 kJ
Calculate the ฮH for the reaction
4. 2N2(g) + 5O2(g) โ 2N2O5(g)
ฮH = 28.4 kJ
22. Use the values of ฮHof from Appendix A handout to calculate the ฮHo for this
reaction:
SiCl4(l) + 2H2O(l) โ SiO2(s) + 4HCl(aq)
o
ฮH = - 20 kJ
23. Use the values of ฮHof from Appendix A handout to calculate the ฮHo for this
reaction: (balance first!)
4 NH3(g) + 7 O2(g) โ 4 NO2(g) + 6 H2O(l)
o
ฮH = - 1396 kJ
24. Write out the equation for the combustion of C3H6(g). Use the values of ฮHof from
the Appendix A handout to calculate the ฮHo for the reaction.
2 C3H6(g) + 9 O2(g) โ 6 CO2(g) + 6 H2O(g)
ฮH = โ 3854.8 kJ
25. Use the values of ฮHof from Appendix A and write each thermochemical equation
used to calculate the ฮHo for problem 24.
3 C(s) + 3 H2(g) โ C3H6(g) ฮH = 20.9kJ
C(s) + O2(g) โ CO2(g) ฮH = -393.5 kJ
H2(g)+ ยฝ O2(g) โ H2O(g) ฮH = -242 kJ