GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
11th Edition
ISBN: 9780134193601
Author: Petrucci
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 7, Problem 21E
A 0.205 g pellet of potassium hydroxide, KOH, is added to 55.9 g water in a Styrofoam coffee cup. The water temperature rises from 23.5 to24.4 °C. (Assume that the specific heat capacity of dilute KOH(aq) is the same as that of water.
a. What is the approximate heat of solution of KOH, expressed as kilojoules per mole of KOH?
b. How could the precision of this measurement be improved without modifying the apparatus?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionChapter 7 Solutions
GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
Ch. 7 - Calculate the quantity of heat, in kilojoules, (a)...Ch. 7 - Calculate the final temperature that results when...Ch. 7 - Refer to Example 7-2. The experiment is repeated...Ch. 7 - A 75.0 g piece of Ag metal is heated to 80.0C and...Ch. 7 - A 465 g chunk of iron is removed from an oven and...Ch. 7 - A piece of stainless steel (C2=0.50Jg-1C-1) is...Ch. 7 - A 1.00 kg sample of magnesium at 40.0C is added to...Ch. 7 - Brass has a density of 8.40 g/cm2 and a specific...Ch. 7 - A 74.8 g sample of copper at 143.2C is added to an...Ch. 7 - A 69.0 g sample of gold at 127.1C is added to an...
Ch. 7 - In the form of heat, 6052 J of energy is...Ch. 7 - What is the final temperature (in C) of 1.24 g of...Ch. 7 - How much heat, in kilojoules, is associated with...Ch. 7 - The standard enthalpy of reaction for the...Ch. 7 - How much heat, in kilojoules, is evolved the...Ch. 7 - Upon complete combustion the indicated substances...Ch. 7 - The combustion of methane gas, the principal...Ch. 7 - Refer to the Integrative Example. What volume of...Ch. 7 - The combustion of hydrogen-oxygen mixtures is used...Ch. 7 - Thermite mixtures are used for certain types of...Ch. 7 - A 0.205 g pellet of potassium hydroxide, KOH, is...Ch. 7 - The heat of solution of Kl(s) in water is...Ch. 7 - You are planning lecture demonstration to...Ch. 7 - Care must be taken in preparing solutions of...Ch. 7 - Refer to Example 7-4. The product of the...Ch. 7 - Prob. 26ECh. 7 - Prob. 27ECh. 7 - Prob. 28ECh. 7 - What mass of ice can be meted the same quantity of...Ch. 7 - What will be the final temperature of the water in...Ch. 7 - A 125 g stainless steel ball bearings...Ch. 7 - Prob. 32ECh. 7 - The enthalpy of sublimation (solid gas) for dry...Ch. 7 - The enthalpy of vaporization forN2 (I)is 5.56...Ch. 7 - A sample gives off 5228 cal when burned in a bomb...Ch. 7 - The following substances undergo complete...Ch. 7 - A bomb calorimetry experiment is performed...Ch. 7 - A coffee-cup calorimeter contains 100.0 mL of...Ch. 7 - A 0.75 g sample of KCI is added to 350 g H2O in a...Ch. 7 - The heat of solution of potassium acetate in water...Ch. 7 - Prob. 41ECh. 7 - Salicylic acid, C7H5O2 , has been suggested as a...Ch. 7 - Refer to Example 7-3. Based on the heat of...Ch. 7 - A 1.397 g sample of thymol, C10H14O(s) (a...Ch. 7 - A g of NaCI is added to a Styrofoam cup of water,...Ch. 7 - can determine purity of solid materials by using...Ch. 7 - Calculate the quantity of work associated with a...Ch. 7 - Calculate the quantity of work, in joules,...Ch. 7 - A 1.00 g sample of Ne(g) at 1 atm pressure and 27C...Ch. 7 - Compressed air in aerosol cans is used to free...Ch. 7 - In each of the following processes, is any work...Ch. 7 - In each of the following processes, any work done...Ch. 7 - If 325 J of work is done by a system at a pressure...Ch. 7 - A movable piston a cylinder holding 5.0 L N2(g) is...Ch. 7 - What is the change in internal energy of a system...Ch. 7 - Whet the change in internal energy of e system if...Ch. 7 - The internal energy of a fixed quantity of an...Ch. 7 - Prob. 58ECh. 7 - Prob. 59ECh. 7 - Prob. 60ECh. 7 - There are other forms of work besides PV work. For...Ch. 7 - Another form of work is extension, defined as the...Ch. 7 - Only one of the following quantities is equal to...Ch. 7 - Determine whether H is equal to, greater than, or...Ch. 7 - The heat of combustion of propan-2-ol at 298.15 K,...Ch. 7 - Prob. 66ECh. 7 - The standard enthalpy of formation of NH2(g) is...Ch. 7 - Use Hess's law to determine rH for the reaction...Ch. 7 - Use Hess's law to determine rH for the reaction 2...Ch. 7 - Given the following information:...Ch. 7 - For the reaction C2H4(g)+CIz(g)C2H4CI2(I) ,...Ch. 7 - Determine rH for this reaction from the data...Ch. 7 - Substitute natural gas (SNG) is a gaseous mature...Ch. 7 - CCI4 , an important commercial solvent, is...Ch. 7 - Use Hess's law and the following data...Ch. 7 - The standard heats of combustion (rH) of butane-l...Ch. 7 - One glucose molecule, C6H12O6(s) is converted to...Ch. 7 - The standard of fermentation of glucose to ethanol...Ch. 7 - Use standard enthalpies of formation from Table...Ch. 7 - Use standard enthalpies of formation from Tables...Ch. 7 - Use the information given here. date from Appendix...Ch. 7 - Prob. 82ECh. 7 - Prob. 83ECh. 7 - Use data from Appendix D to calculate rH for the...Ch. 7 - Prob. 85ECh. 7 - Use data from Table 7.2, together with the...Ch. 7 - Use data from Table 7.2 and rH for re following...Ch. 7 - Use data from Table 7.2 and rH for the following...Ch. 7 - Prob. 89ECh. 7 - Prob. 90ECh. 7 - The decomposition of limestone, CaCO2(s) into...Ch. 7 - Use data from Table 7.2 to calculate the volume of...Ch. 7 - Ants release formic acid (HCOOH) when they bite....Ch. 7 - Prob. 94ECh. 7 - A British thermal unit (Btu) is defined as the...Ch. 7 - What volume of 18.5C water must be added, together...Ch. 7 - A 7.26 kg shot (as used the sporting event, the...Ch. 7 - An alternative approach to bomb calorimetry is to...Ch. 7 - Prob. 99IAECh. 7 - Prob. 100IAECh. 7 - Determine the missing values of rH in the diagram...Ch. 7 - A particular natural gas consists, in mole...Ch. 7 - Prob. 103IAECh. 7 - Prob. 104IAECh. 7 - A calorimeter that measures an exothermic heat of...Ch. 7 - For the reaction C2H4(g)+3O2(g)2CO2(g)+2H2O(I)...Ch. 7 - Some of the butane, C4H10(g) , in a 200.0 L...Ch. 7 - The metabolism of glucose, C5H12O5 yields CO2(g)...Ch. 7 - Prob. 109IAECh. 7 - Upon complete combustion, a 1.00 L sample (at STP)...Ch. 7 - Prob. 111IAECh. 7 - Refer to the discussion of the gasification of...Ch. 7 - A 1.103 g sample of a gaseous...Ch. 7 - Several factors are involved in determining the...Ch. 7 - Prob. 115IAECh. 7 - Prob. 116IAECh. 7 - Prob. 117IAECh. 7 - In the Are You Wondering 7-1 box, the temperature...Ch. 7 - Prob. 119IAECh. 7 - Prob. 120IAECh. 7 - Cetane, C15H34, is a typical petrodiesel with a...Ch. 7 - Carbon dioxide emissions have been implicated as a...Ch. 7 - Prob. 123FPCh. 7 - Prob. 124FPCh. 7 - We can use the heat liberated by a neutralization...Ch. 7 - In a student experiment to confirm Hess's law, the...Ch. 7 - Prob. 127FPCh. 7 - Refer to Example 7-5 dealing with the work done by...Ch. 7 - Look up the specific heat capacity of several...Ch. 7 - In your own words, define or explain the following...Ch. 7 - Prob. 131SAECh. 7 - Explain the important distinctions between each...Ch. 7 - The temperature increase of 225 mL of water at 25C...Ch. 7 - A plausible final temperature when 75.0 ml of...Ch. 7 - U= 100 J for a system that gives off 100 J of heat...Ch. 7 - Prob. 136SAECh. 7 - The standard molar enthalpy of formation of CO2(g)...Ch. 7 - Write the formation reaction for each of the...Ch. 7 - Compute rH for the following reactions. The value...Ch. 7 - When dissolved in water, 1.00 mol LiCI produces...Ch. 7 - Prob. 141SAECh. 7 - Prob. 142SAECh. 7 - Prob. 143SAECh. 7 - A 1.22 kg piece of iron at 126.5C is dropped into...Ch. 7 - Prob. 145SAECh. 7 - The standard molar heats of combustion of...Ch. 7 - Prob. 147SAECh. 7 - Prob. 148SAECh. 7 - Prob. 149SAECh. 7 - Prob. 150SAECh. 7 - Prob. 151SAECh. 7 - Prob. 152SAECh. 7 - Prob. 153SAECh. 7 - Prob. 154SAE
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Shown below is a diagram depicting the enthalpy change of a chemical reaction run at constant pressure. a Is the reaction exothermic or endothermic? b What is the sign of H? c What is the sign of q? d If the reaction does no work, what is the sign of E for this process?arrow_forward9.35 A piece of titanium metal with a mass of 20.8 g is heated in boiling water to 99.5°C and then dropped into a coffee cup calorimeter containing 75.0 g of water at 2 1.7°C. When thermal equilibrium is reached, the final temperature is 24.3°C. Calculate the specific heat capacity of titanium.arrow_forwardWhen a 0.740-g sample of trinitrotoluene (TNT), C7H5N2O6, is burned in a bomb calorimeter, the temperature increases from 23.4 C to 26.9 C. The heat capacity of the calorimeter is 534 J/C, and it contains 675 mL of water. How much heat was produced by the combustion of the TNT sample?arrow_forward
- A sample of nickel is heated to 99.8C and placed in a coffee-cup calorimeter containing 150.0 g water at 23.5C. After the metal cools, the final temperature of metal and water mixture is 25.0C. If the specific heat capacity of nickel is 0.444 J/C g, what mass of nickel was originally heated? Assume no heat loss to the surroundings.arrow_forwardA piece of titanium metal with a mass of 20.8 g is heated in boiling water to 99.5 C and then dropped into a coffee-cup calorimeter containing 75.0 g of water at 21.7 C. When thermal equilibrium is reached, the final temperature is 24.3 C. Calculate the specific heat capacity of titanium.arrow_forward9.104 An engineer is using sodium metal as a cooling agent in a design because it has useful thermal properties. Looting up the heat capacity, the engineer finds a value of 28.2 J mol-l °C-l. Carelessly, he wrote this number down without units. As a result, it was later taken as specific heat. (a) What would he the difference between these two values? (b) Would the engineer overestimate the ability of sodium to remove heat from the system or underestimate it because of this error? Be sure to explain your reasoning.arrow_forward
- A typical fat in the body is glyceryl trioleate, C57H104O6. When it is metabolized in the body, it combines with oxygen to produce carbon dioxide, water, and 3.022104 kJ of heat per mole of fat. (a) Write a balanced thermochemical equation for the metabolism of fat. (b) How many kilojoules of energy must be evolved in the form of heat if you want to get rid of five pounds of this fat by combustion? (c) How many nutritional calories is this? (1 nutritional calories =1103 calories)arrow_forwardA 50-mL solution of a dilute AgNO3 solution is added to 100 mL of a base solution in a coffee-cup calorimeter. As Ag2O(s) precipitates, the temperature of the solution increases from 23.78 C to 25.19 C. Assuming that the mixture has the same specific heat as water and a mass of 150 g, calculate the heat q. Is the precipitation reaction exothermic or endothermic?arrow_forwardWhen 1.000 g of gaseous butane, C4H10, is burned at 25C and 1.00 atm pressure, H2O(l) and CO2(g) are formed with the evolution of 49.50 kJ of heat. a Calculate the molar enthalpy of formation of butane. (Use enthalpy of formation data for H2O and CO2.) b Gf of butane is 17.2 kJ/mol. What is G for the combustion of 1 mol butane? c From a and b, calculate S for the combustion of 1 mol butane.arrow_forward
- In a bomb calorimeter, the reaction vessel is surrounded by water that must be added for each experiment. Since the amount of water is not constant from experiment to experiment, the mass of water must be measured in each case. The heat capacity of the calorimeter is broken down into two parts: the water and the calorimeter components. If a calorimeter contains 1.00 kg water and has a total heat capacity of 10.84 kJ/C, what is the heat capacity of the calorimeter components?arrow_forwardThe decomposition of ozone, O3, to oxygen, O2, is an exothermic reaction. What is the sign of q? If you were to touch a flask in which ozone is decomposing to oxygen, would you expect the flask to feel warm or cool?arrow_forwardThe temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it passes through the radiator it has a temperature of 175 F. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g oC.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry by OpenStax (2015-05-04)ChemistryISBN:9781938168390Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark BlaserPublisher:OpenStax
- Chemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningPrinciples of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning
Chemistry: The Molecular Science
Chemistry
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:Cengage Learning
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
Chemistry by OpenStax (2015-05-04)
Chemistry
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:OpenStax
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Principles of Modern Chemistry
Chemistry
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:Cengage Learning
The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY