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Entropy Solutions Library

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288 solutions

Entropy

Q. For each reaction, find the value of delta S. Report the value with the appropriate sign.(J/K)c) C6H12O6 (s) + 6 O2(g) → 6 CO2 (g) + 6 H2O (g)

Solved • Apr 9, 2021

Entropy

Q. For each reaction, find the value of delta S. Report the value with the appropriate sign.(J/K)b) N2 (g) +3 F2 (g) → 2 NF3 (g)

Solved • Apr 9, 2021

Entropy

Q. Part B. Calculate ΔS°rxn for the balanced chemical equation: H2S(g)+2O2(g)→H2O(g)+SO3(g)

Solved • Apr 7, 2021

Entropy

Q. Which of the following reactions have a positive ΔSrxn? Check all that apply.2 A(g) + B(g) → C(g)A(g) + B(g) → 3 C(g)2 A(g) + 3 B(g) → 4 C(g)2 A(g)...

Solved • Mar 30, 2021

Entropy

Q. Which change has a positive ΔS?

Solved • Mar 30, 2021

Entropy

Q. Calculate ΔS∘rxn for the reaction 2NO(g)+O2(g)→2NO2(g)SubstanceS∘ (J/mol⋅K)NO2240.0O2205.2NO210.8

Solved • Mar 30, 2021

Entropy

Q. Which of the following processes would you expect to have a negative value for entropy? NaCl(s) → Na+(aq) + Cl- (aq) H2O(s) →H2O(l) NaCl(s) →NaCl(l...

Solved • Mar 30, 2021

Entropy

Q. Calculate the standard entropy change for the reaction 2H2(g)+O2(g)→2H2O(l) using the data from the following table:SubstanceΔH°f (kJ/mol)ΔG°f (kJ/...

Solved • Mar 23, 2021

Entropy

Q. Given the values of ΔH°rxn, ΔS°rxn, and T below, determine ΔSuniv.Part 1 ΔH°rxn = 84 kJ , ΔS°rxn,= 144 J/K , T= 303 KExpress your answer using two ...

Solved • Mar 22, 2021

Entropy

Q. Consider the following reactions at 298 K:2 Al (s) + 3 Cl2 (g) → 2 AlCl3 (s) ΔH° = -1408.4 kJCalculate the following quantities. Find standard entr...

Solved • Mar 17, 2021

Entropy

Q. Which of the following reactions have a positive ΔSrxn? Check all that apply.2A(g)+B(g) → C(g)A(g)+B(g) → 3C(g)2A(g)+3B(g) → 4C(g)2A(g)+B(s) → 3C(g)

Solved • Mar 17, 2021

Entropy

Q. In this reaction ________.a) Entropy has decreased b) The chemical energy of the products is greater than that of the reactantsc) The kinetic energ...

Solved • Mar 17, 2021

Entropy

Q. In this reaction _____.A) Entropy has decreasedB) The products have been rearranged to form reactantsC) The products have less potential energy tha...

Solved • Mar 17, 2021

Entropy

Q. Use the standard entropy data in Appendix G to determine the change in entropy for each of the reactions listed below. All the processes occur at t...

Solved • Mar 2, 2021

Entropy

Q. Use the standard entropy data in Appendix G to determine the change in entropy for each of the reactions listed below. All the processes occur at t...

Solved • Mar 2, 2021

Entropy

Q. Use the standard entropy data in Appendix G to determine the change in entropy for each of the reactions listed below. All the processes occur at t...

Solved • Mar 2, 2021

Entropy

Q. Use the standard entropy data in Appendix G to determine the change in entropy for each of the reactions listed below. All the processes occur at t...

Solved • Mar 2, 2021

Entropy

Q. Complete the following sentences on predicting the relative entropy of a system.The words are: decreases, equal to, increases, less than, greater t...

Solved • Feb 9, 2021

Entropy

Q. When two pure substances are mixed to form a solutionA. heat is released.B. heat is absorbed.C. there is an increase in entropy.D. there is a decre...

Solved • Feb 1, 2021

Entropy

Q. Using the following data, calculate ΔSfus and ΔSvap for K.

Solved • Jan 26, 2021

Entropy

Q. Which of the following reactions have a positive ΔSrxn? Check all that apply.A(g) + 2B(g) -->2C(g)2A(g) + B(g) -->C(g)2A(g) + 2B(g) -->5C(...

Solved • Nov 9, 2020

Entropy

Q. Without referring to a data table, rank the following compounds by standard molar entropy.

Solved • Nov 9, 2020

Entropy

Q. Using the following data, calculate ΔSfus and ΔSvap for HCl. Determine the entropy change when 9.30 mol of HCl(g) condenses at atmospheric pressure.

Solved • Nov 4, 2020

Entropy

Q. Predict how the entropy of the substance is affected in the following processes: a) Ar(l) → Ar(g) b) I2(g, 1 bar, 125°C) → I2(g, 1 bar, 200°C) c) H...

Solved • Nov 2, 2020

Entropy

Q. Calculate ΔS°rxn for the reaction 2 NO(g) + O2(g) → 2 NO2(g).SubstanceS° (J/mol⋅K)NO2240.0O2205.2NO210.8

Solved • Oct 23, 2020

Entropy

Q. Two systems, each composed of three particles represented by circles, have 30 J of total energy. How many energetically equivalent ways can you dis...

Solved • Oct 23, 2020

Entropy

Q. What do we call the part of the universe that is not part of the system?

Solved • Jun 30, 2020

Entropy

Q. The ΔH°vap for pure water is 40.65 kJ/mol. Calculate the ΔS°vap for pure water.

Solved • Apr 30, 2020

Entropy

Q. For each of these processes, is the entropy change positiveor negative?i.) The melting of ice cubes at -5 Celsiusii.) The dissolving of sugar in ho...

Solved • Apr 30, 2020

Entropy

Q. In a chemical reaction two gases combine to form a solid. What do you expect the sign of ΔS to be?

Solved • Apr 30, 2020

Entropy

Q. Why does the entropy of a gas increase when it expands into a vacuum?

Solved • Apr 29, 2020

Entropy

Q. Predict how the entropy of the substance is affected in the following processes: a) Ar(l) → Ar(g)b) Cu(s, 300 K) → Cu(s, 800 K)c) H2O (g, 75 Torr, ...

Solved • Apr 28, 2020

Entropy

Q. Calculate the standard entropy change for the reaction2Mg(s) + O2(g) → 2MgO(s)using the data from the following table: Substance ?H?f (kJ/mol)?G?f ...

Solved • Apr 21, 2020

Entropy

Q. Calculate the standard entropy change for the following reaction at 25 °C.MgCl2(s)+H2O(l) → MgO(s)+2HCl(g).ΔS rxn = ?

Solved • Apr 15, 2020

Entropy

Q. Using the following data, Calculate ΔSfus and Δvap for HBr.Determine the entropy change when 4.80 mol of HBr (f) freezes at atmospheric pressure. 

Solved • Apr 13, 2020

Entropy

Q. Using the following data, Compound  Melting Point (C)  delta Hfus (kJ/mol)  Boiling Point (C)  delta H vap  HF -83.11 4.577 19.54 25.18 HCl -114.3 ...

Solved • Apr 9, 2020

Entropy

Q. Using the following data,Calculate ?Sfus and ?Svap for Cs.

Solved • Mar 25, 2020

Entropy

Q. Find delta S for the formation of 1 mole of PCl5 (g) for its elements

Solved • Mar 20, 2020

Entropy

Q. Using the following data,calculate ΔSfus and ΔSvap for Rb.

Solved • Mar 20, 2020

Entropy

Q. Using the following data,CompoundMelting Point (°C)   ?Hfus (kJ/mol) Boiling Point (°C)   ?Hvap (kJ/mol) HF -83.11 4.577 19.54 25.18 HCl -114.3 1.9...

Solved • Mar 18, 2020

Entropy

Q. Using the following data, Compound     Melting point (°C)     ΔHfus (kJ/mol)     Boiling point (°C)     ΔHvap (kJ/mol)HF                   -83.11  ...

Solved • Mar 17, 2020

Entropy

Q. Predict how the entropy of the substance is affected in the following processes: a) O2(g, 200 kPa, 300 K) → O2(g, 100 kPa, 300 K)b) I2(g, 1 bar, 12...

Solved • Mar 13, 2020

Entropy

Q. 1. Using the following data,Calculate ∆Sfus and ∆Svap for Na.ΔSfus = J•K-1•mol-1ΔSvap = J•K-1•mol-12. Using the following data,calculate the ΔSfus ...

Solved • Mar 13, 2020

Entropy

Q. Classify each process by its individual effect on the entropy of the universe, S. Drag the appropriate items to their respective bins.

Solved • Mar 12, 2020

Entropy

Q. For which of the following reactions is ∆S° > 0 at 25°C?A) 2H2(g) + O2(g) → 2H2O(g)B) 2ClBr(g) → Cl2(g) + Br2(g)C) I2(g) → I2(s)D) 2NO(g) + O2(g...

Solved • Feb 18, 2020

Entropy

Q. Calculate ∆S°for the reaction4Cr(s)      +      3O2(g)      →      2Cr2O3(s)Substance:                 Cr(s)              O2(g)               Cr2O3...

Solved • Feb 18, 2020

Entropy

Q. Which relationship or statement best describes ∆S° for the following reaction?2NH3(g) + 2ClF3(g) → 6HF(g) + N2(g) + Cl2(g)A) ∆S° ≈ 0B) ∆S° < 0C)...

Solved • Feb 18, 2020

Entropy

Q. Which relationship or statement best describes ∆S° for the following reaction?2 H2(g) + O2(g) → 2 H2O (l)A) ∆S° < 0B) ∆S° > 0C) ∆S° ≈ 0D) ∆S°...

Solved • Feb 18, 2020

Entropy

Q. Which of the following should have the greatest molar entropy, Sf, at 298 K?A) NH3(l)B) H2O(l)C) NaCl(s)D) N2O4(g)E) H2(g)

Solved • Feb 18, 2020

Entropy

Q. Which one of the following processes produces a decrease in the entropy of the system?A) boiling water to form steamB) melting ice to form waterC) ...

Solved • Jan 28, 2020

Entropy

Q. TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.The entropy of a pure crystalline substance at 0 °C is zero.

Solved • Jan 28, 2020

Entropy

Q. Which of the following result(s) in a decrease in the entropy of the system? I. NH3(1 atm, 298 K) → NH3(3 atm, 298 K) II. Br2(g) → Br2(l) III. NaBr...

Solved • Dec 19, 2019

Entropy

Q. For each pair of substances, at the same temperature, choose the one with the higher entropy:I. (i) I2(l) (ii) I2(s)II. (i) PCl3(g) (ii) PCl5(g)III...

Solved • Dec 19, 2019

Entropy

Q. Which of the following result(s) in an increase in the entropy of the system?I. condensation of a gas to a liquidII. decreasing the volume of 1.0 m...

Solved • Dec 18, 2019

Entropy

Q. Which involves the greatest increase in entropy?a. H2O(l, 100°C) → H2O(s, 0°C)b. H2O(g, 100°C) → H2O(s, 0°C)c. H2O(g, 100°C) → H2O(l, 100°C)d. H2O(...

Solved • Dec 18, 2019

Entropy

Q. Which of the following reactions will have a negative value of ΔS?(i) Ba2+(aq) + SO42-(aq) → BaSO4(s)(ii) 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g)(i...

Solved • Dec 17, 2019

Entropy

Q. Which of the following reactions will have a negative value of ∆S?(i) Ba2+(aq) + SO42-(aq) → BaSO4(s)(ii) 2 Na(s) + 2H2O(l) → 2 NaOH(aq) + H2(g)(ii...

Solved • Dec 16, 2019

Entropy

Q. When does entropy increase and when does it decrease?

Solved • Aug 7, 2019

Entropy

Q. The element gallium (Ga) freezes at 29.8°C, and its molar enthalpy of fusion is ΔH fus = 5.59kJ/mol.1. When molten gallium solidifies to Ga(s) at i...

Solved • Jul 10, 2019

Entropy

Q. Predict which of the following compounds follow Trouton's rule:

Solved • Jul 9, 2019

Entropy

Q. For each of the following pairs, predict which substance possesses the larger entropy per mole.Compare 1 mol of O2(g)  at 300 oC, 0.01 atm and 1 mo...

Solved • Jan 3, 2019

Entropy

Q. In chemical kinetics, the entropy of activation is the entropy change for the process in which the reactants reach the activated complex.Predict ...

Solved • Jan 3, 2019

Entropy

Q. For each of the following pairs, predict which substance has the higher entropy per mole at a given temperature.He(l) or He(g).

Solved • Jan 3, 2019

Entropy

Q. For each of the following pairs, predict which substance has a higher entropy per mole at a given temperature.He(g) at 5 atm pressure or He(g) at 1...

Solved • Jan 3, 2019

Entropy

Q. If the normal boiling point of a liquid is 67 oC, and the standard molar entropy change for the boiling process is +100 J/K, estimate the standard ...

Solved • Jan 3, 2019

Entropy

Q. Indicate whether each statement is true or false.Unlike enthalpy, where we can only ever know changes in H, we can know absolute values of S.

Solved • Jan 3, 2019

Entropy

Q. If energy can flow in and out of the system to maintain a constant temperature during the process, what can you say about the entropy change of the...

Solved • Jan 3, 2019

Entropy

Q. Does the entropy of the system increase, decrease, or stay the same for each of the following conditions.

Solved • Jan 3, 2019

Entropy

Q. Entropy decreases when NO(g) is oxidized by O2(g) to NO2(g).What major factor leads to a decrease in entropy as the reaction shown takes place?

Solved • Jan 3, 2019

Entropy

Q. The diagram shows the variation in entropy with temperature for a substance that is a gas at the highest temperature shown.Why is the entropy chang...

Solved • Jan 3, 2019

Entropy

Q. How does the entropy of the system change when a solid melts, a gas liquefies, a solid sublimes?

Solved • Jan 3, 2019

Entropy

Q. Estimate whether the entropy of the system increases or decreases during each process.(a) photodissociation of O2 (g),(b) formation of ozone from o...

Solved • Jan 3, 2019

Entropy

Q. For which of the following processes does the entropy of the system increase?(a) the ripening of a banana,(b) dissolution of sugar in a cup of hot ...

Solved • Jan 3, 2019

Entropy

Q. Predict the sign of the entropy change of the system for each of the following reactions.(a) N2 (g) + 3H2 (g)  →  2NH3 (g)(b) CaCO3(s)  →  CaO(s) +...

Solved • Jan 3, 2019

Entropy

Q. Which process has the larger entropy change: melting ice or boiling water?

Solved • Jan 3, 2019

Entropy

Q. Calculate the change in entropy that occurs in the system when 30.5 g of acetone (C3H6O) vaporizes from a liquid to a gas at its normal boiling poi...

Solved • Jan 3, 2019

Entropy

Q. Calculate the change in entropy that occurs in the system when 45.0 g of acetone (C3H6O) freezes at its melting point (-94.8 ˚C). ΔHfus = 5.69 kJ/mol.

Solved • Jan 3, 2019

Entropy

Q. Calculate ΔS˚rxn for the balanced chemical equation2 H2S(g) + 3 O2(g)  →  2 H2O(g) + 2 SO2(g)Standard enthalpies for selected substances at 25oC Su...

Solved • Jan 3, 2019

Entropy

Q. Without doing any calculations, determine the sign of ΔSsys for each of the following chemical reactions.a. Mg(s) + Cl2(g) → MgCl2(s)b. 2 H2S(g) + ...

Solved • Jan 3, 2019

Entropy

Q. Rank the following substances in order of decreasing standard molar entropy (S˚).a. I2(g); F2(g); Br2(g); Cl2(g)b. H2O(g); H2O2(g); H2S(g)c. C(s, g...

Solved • Jan 3, 2019

Entropy

Q. Without doing any calculations, determine the sign of ΔSsys and ΔSsurr for each of the chemical reactions below.2 CO(g) + O2(g) ⇌ 2 CO2(g), ΔH˚rxn ...

Solved • Jan 3, 2019

Entropy

Q. Without doing any calculations, determine the sign of ΔSsys and ΔSsurr for each of the chemical reactions below.2 NO2(g) → 2 NO(g) + O2(g), ΔH˚rxn ...

Solved • Jan 3, 2019

Entropy

Q. Which reaction is most likely to have a positive ΔSsys?a) SiO2(s) + 3 C(s) → SiC(s) + 2 CO(g)b) 6 CO2(g) + 6 H2O(g) → C6H12O6(s) + 6 O2(g)c) CO(g) ...

Solved • Jan 3, 2019

Entropy

Q. Arrange the gases – F2, Ar, and CH3F – in order of increasing standard entropy (S˚) at 298 K.

Solved • Jan 3, 2019

Entropy

Q. Use standard entropies to calculate ΔS˚rxn for the balanced chemical equation: 2 PCl3(l) + O2(g) →  2 POCl3(l)SubstanceΔS˚ (J/mol•K)POCl3(l)222.5PO...

Solved • Jan 3, 2019

Entropy

Q. Given the data, calculate ΔSvap for each liquids. (ΔSvap = ΔHvap/T, where T is in K)CompoundNameBP (oC)ΔHvap (kJ/mol) at BPC4H10ODiethyl ether34.62...

Solved • Jan 3, 2019

Entropy

Q. Determine the sign of ΔSsys in each of the following processes: dry ice subliming

Solved • Jan 3, 2019

Entropy

Q. Calculate ΔS˚rxn for each of the reactions given below.3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Solved • Jan 3, 2019

Entropy

Q. Find ΔS˚ for the formation of CH3Cl(g) { m CH}_3{ m Cl}(g) from its elements in their standard states.

Solved • Jan 3, 2019

Entropy

Q. Calculate ΔSsurr at the indicated temperature for a reaction.ΔH˚rxn = –279 kJ; 298 K

Solved • Jan 3, 2019

Entropy

Q. Calculate ΔSsurr at the indicated temperature for a reaction.ΔH˚rxn = 128 kJ; 73 K

Solved • Jan 3, 2019

Entropy

Q. Use data from Appendix IIB in the textbook to calculate ΔS˚rxn for each of the following reactions.C2H4(g) + H2(g) → C2H6(g)

Solved • Jan 3, 2019

Entropy

Q. Without doing any calculations, determine the sign of ΔSsys for each of the following chemical reactions.a. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)...

Solved • Jan 3, 2019

Entropy

Q. Consider these three changes in the possible distributions of six gaseous particles within three interconnected boxes. Which change has a positive ΔS?

Solved • Jan 3, 2019

Entropy

Q. Given the thermodynamic data below, calculate ΔS and ΔS surr for the following reaction at 25°C and 1 atm:                       XeF  6(g) →XeF4(s)...

Solved • Dec 3, 2018

Entropy

Q. For rubidium ΔH°vap = 69.0 kJ/mol at 686°C, its boiling point. Calculate ΔS°, and q for the vaporization of 1.00 mole of rubidium at 686°C and 1.00...

Solved • Dec 3, 2018

Entropy

Q. Rank the contents of the following containers in order of decreasing entropy.

Solved • Dec 3, 2018

Entropy

Q. Predict the sign of ΔS° and then calculate ΔS° for each of the following reactions.b. 2SO3 (g) → 2SO2 (g) + O2 (g)

Solved • Nov 30, 2018

Entropy

Q. For each of the following pairs, which substance has the greater value of S?b. N2O(g) (at 1 atm, 25°C) or He(g) (at 1 atm, 25°C)

Solved • Nov 30, 2018

Entropy

Q. The enthalpy of vaporization of ethanol is 38.7 kJ/mol at its boiling point (78°C). Determine ΔSsys, ΔSsurr, and ΔSuniv when 1.00 mole of ethanol i...

Solved • Nov 30, 2018