Thermodynamics, Statistical Thermodynamics, & Kinetics
3rd Edition
ISBN: 9780321766182
Author: Thomas Engel, Philip Reid
Publisher: Prentice Hall
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Chapter 4, Problem 4.17CP
Interpretation Introduction
Interpretation:
The condition under which the change in enthalpy (ΔH) equals the change in internal energy (ΔU) needs to be identified
Concept Introduction:
Enthalpy (H) and internal energy (U) are both
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Chapter 4 Solutions
Thermodynamics, Statistical Thermodynamics, & Kinetics
Ch. 4 - In calculating HR at 285.15 K, only the Hf of the...Ch. 4 - What is the point of having an outer water bath in...Ch. 4 - Is the following statement correct? If not rewrite...Ch. 4 - Does the enthalpy of formation of H2Ol change if...Ch. 4 - Why are elements included in the sum in Equation...Ch. 4 - Why are heat capacities of reactants and products...Ch. 4 - Prob. 4.7CPCh. 4 - Prob. 4.8CPCh. 4 - Prob. 4.9CPCh. 4 - Prob. 4.10CP
Ch. 4 - Prob. 4.11CPCh. 4 - Prob. 4.12CPCh. 4 - You wish to measure the heat of solution of NaCl...Ch. 4 - Prob. 4.14CPCh. 4 - Prob. 4.15CPCh. 4 - Prob. 4.16CPCh. 4 - Prob. 4.17CPCh. 4 - Dogs cool off in hot weather by panting. Write a...Ch. 4 - Prob. 4.19CPCh. 4 - Prob. 4.20CPCh. 4 - Given the data in Table 4.1 (Appendix, Data...Ch. 4 - Prob. 4.2NPCh. 4 - A sample of K(s) of mass 2.740 g undergoes...Ch. 4 - Calculate Hf for NO(g) at 975 K, assuming that the...Ch. 4 - Prob. 4.5NPCh. 4 - Derive a formula for HRT for the reaction...Ch. 4 - Prob. 4.7NPCh. 4 - Prob. 4.8NPCh. 4 - Calculate the standard enthalpy of formation of...Ch. 4 - The following data are a DSC scan of a solution of...Ch. 4 - Prob. 4.11NPCh. 4 - Prob. 4.12NPCh. 4 - Prob. 4.13NPCh. 4 - Prob. 4.14NPCh. 4 - Prob. 4.15NPCh. 4 - The total surface area of Asia consisting of...Ch. 4 - Prob. 4.17NPCh. 4 - A sample of Na2SO4s is dissolved in 225 g of water...Ch. 4 - Nitrogen is a vital component of proteins and...Ch. 4 - Prob. 4.20NPCh. 4 - Prob. 4.21NPCh. 4 - A 0.1429 g sample of sucrose C12H22O11 is burned...Ch. 4 - Prob. 4.23NPCh. 4 - Prob. 4.24NPCh. 4 - Prob. 4.25NPCh. 4 - Given the following heat capacity data at 298 K,...Ch. 4 - Calculate H for the process in which Cl2g...Ch. 4 - From the following data at 298.15 K C, calculate...Ch. 4 - Prob. 4.29NPCh. 4 - Use the average bond energies in Table 4.3 I to...Ch. 4 - Prob. 4.31NPCh. 4 - Prob. 4.32NPCh. 4 - Prob. 4.33NPCh. 4 - Prob. 4.34NPCh. 4 - Prob. 4.35NP
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- A sample of benzene, C6H6, weighing 3.51 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 37.18C. If the heat capacity of the calorimeter and contents was 12.05 kJ/C, what is the value of q for burning 1.00 mol of benzene at constant volume and 25.00C? The reaction is C6H6(l)+152O2(g)6CO2(g)+3H2O(l) Is q equal to U or H?arrow_forward9.42 Why is enthalpy generally more useful than internal energy in the thermodynamics of real world systems?arrow_forwardA sample of ethanol, C2H5OH, weighing 2.84 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 33.73C. If the heat capacity of the calorimeter and contents was 9.63 kJ/C, what is the value of q for burning 1.00 mol of ethanol at constant volume and 25.00C? The reaction is C2H5OH(l)+3O2(g)2CO2(g)+3H2O(l) Is q equal to U or H?arrow_forward
- The head of a strike anywhere match contains tetraphosphorus trisulfide, P4S3. In an experiment, a student burned this compound in an excess of oxygen and found that it evolved 3651 kJ of heat per mole of P4S3 at a constant pressure of 1 atm. She wrote the following thermochemical equation: P4S3(s)+8O2(g)P4O10(s)+3SO2(g);H=3651kJ Calculate the standard enthalpy of formation of P4S3, using this students result and the following standard enthalpies of formation: P4O10(s), 3009.9 kJ/mol; SO2(g), 296.8 kJ/mol. How does this value compare with the value given in Appendix C?arrow_forwardWrite the balanced chemical equation for the combustion of benzene, C6H6(l), to give carbon dioxide and water vapor. Would you expect S to be positive or negative in this process?arrow_forwardThree gas-phase reactions were run in a constant-pressure piston apparatus as shown in the following illustration. For each reaction, give the balanced reaction and predict the sign of w (the work done) for the reaction. . If just the balanced reactions were given, how could you predict the sign of w for a reaction?arrow_forward
- Gasohol, a mixture of gasoline and ethanol, C2H5OH, is used as automobile fuel. The alcohol releases energy in a combustion reaction with O2. C2H5OH(l)+3O2(g)2CO2(g)+3H2O(l) If 0.115 g ethanol evolves 3.62 kJ when burned at constant pressure, calculate the combustion enthalpy for ethanol.arrow_forwardUse Appendix L to find the standard enthalpies of formation of oxygen atoms, oxygen molecules (O2), and ozone (O3). What is the standard state of oxygen? Is the formation of oxygen atoms from O2 exothermic? What is the enthalpy change for the formation of 1 mol of O3 from O2?arrow_forwardHydrogen sulfide, H2S, is a poisonous gas with the odor of rotten eggs. The reaction for the formation of H2S from the elements is H2(g)+18S3(rhombic)H2S(g) Use Hesss law to obtain the enthalpy change for this reaction from the following enthalpy changes: H2S(g)+32O2(g)H2O(g)+SO2(g);H=518kJH2(g)+12O2(g)H2O(g);H=242kJ18S8(rhombic)+O2(g)SO2(g);H=297kJarrow_forward
- Write the balanced chemical equation for the combustion of methane, CH4(g), to give carbon dioxide and water vapor. Explain why it is difficult to predict whether S is positive or negative for this chemical reaction.arrow_forwardWhen a gas expands, what is the sign of w? Why? When a gas contracts, what is the sign of w? Why? What are the signs of q and w for the process of boiling water?arrow_forwardMethanol (CH3OH) has also been proposed as an alternative fuel. Calculate the standard enthalpy of combustion per gram of liquid methanol, and compare this answer to that for ethanol in Exercise 87.arrow_forward
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