Selected Solutions Manual For General Chemistry: Principles And Modern Applications
11th Edition
ISBN: 9780133387902
Author: Ralph H. Petrucci, F. Geoffrey Herring, Jeffry D. Madura, Carey Bissonnette
Publisher: PEARSON
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Chapter 7, Problem 98IAE
An alternative approach to bomb calorimetry is to establish the heat capacity of the calorimeter, exclusive of the water in contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together. A bomb calorimeter assembly containing 983.5 g water is calibrated by the combustion of 1.354 g anthracene. The temperature of the calorimeter rises from 24.87 to 35.63 °C. When1.053 g citric acid is burned in same assembly, but with 968.6 g water, the temperature increases from 25.01 to 27.19 °C. The heat of combustion of anthracene,
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Experiment:
Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below.
Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization.
Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C
Sample C-Cool the third sample in an ice-bath to 0-2 °C
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weight after recrystalization and melting point temp.
A=0.624g,102-115°
B=0.765g, 80-105°
C=1.135g, 77-108
What is the percent yield of A,B, and C.
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Chapter 7 Solutions
Selected Solutions Manual For General Chemistry: Principles And Modern Applications
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
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