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Entropy Solutions Library

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295 solutions

Entropy

Q. Using the data in the table, calculate the standard entropy changes for the following reactions at 25°.

Solved • Feb 14, 2018

Entropy

Q. Given the standard entropy values in the table below, determine the standard entropy change of the reaction below that produces 10.0 g of metallic ...

Solved • Feb 14, 2018

Entropy

Q. Calculate the boiling point of benzene, C6H6 from the data given below:C6H6 (l) → C6H6 (g)  

Solved • Jan 4, 2018

Entropy

Q. Consider the following reaction at 298 K:2C (graphite) + O2 (g) → 2CO (g)  Delta H = -110.5 kJCalculate:Delta S(sys) J/KDelta S (surr) J/KDelta S (...

Solved • Jan 4, 2018

Entropy

Q. Consider the following reaction at 298 K2Al (s) + 3Cl2 (g) → 2AlCl3 (s)         H=-1408 KJCalculate the following quantities:(a) Ssys= ? (b) Ssurr=...

Solved • Jan 3, 2018

Entropy

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

Solved • Dec 15, 2017

Entropy

Q. Which of the following reactions have a positive ΔS rxn?  a) 2 A(g) + B(s) → 3 C(g) b) 2 A(g) + B(g) → C(g) c) A(g) + B(g) → C(g) d) 2 A(g) + 2...

Solved • Dec 15, 2017

Entropy

Q. A favorable entropy change occurs when ΔS is positive. What can be said about the order of the system when ΔS is positive.a) system order increases...

Solved • Dec 14, 2017

Entropy

Q. For the following questions circle the correct answer. There is one and only one correct answer.The substance with the largest value for entropy (a...

Solved • Oct 31, 2017

Entropy

Q. ΔS is positive for the reaction _______.a. CaO(s) + CO2(g) → CaCO3(s)b. N2(g) + 3H2(g) → 2NH3(g)c. 2SO3(g) → 2SO2(g) + O2(g)d. Ag+(aq) + Cl-(aq)→Ag...

Solved • Oct 17, 2017

Entropy

Q. Which one of the following processes produces a decrease in the entropy of the system? a. boiling water to form steam b. dissolution of solid KCl...

Solved • Oct 17, 2017

Entropy

Q. The thermodynamic quantity that expresses the degree of disorder in a system is _________. a. enthalpy b. internal energy c. bond energy d. ent...

Solved • Oct 17, 2017

Entropy

Q. Consider the following reaction at 298 K:2 H2 (g) + O2 (g) → 2 H2O (g)     ΔH= -483.6 KJCalculate the following quantities.i) ΔSsys=ii) ΔSsurr=iii)...

Solved • Sep 26, 2017

Entropy

Q. Which of the following reactions have a positive delta S rxn? Check all that apply.

Solved • Sep 25, 2017

Entropy

Q. Rank these systems in order of decreasing entropy.Rank from highest to lowest entropy. To rank items as equivalent, overlap them.i) 1 mol of oxygen...

Solved • Sep 25, 2017

Entropy

Q. Without referring to a data table, rank the following compounds by standard molar entropy.i) CH3OH (g)ii) O2 (g)iii) N2 (g) 

Solved • Sep 23, 2017

Entropy

Q. The compound benzoic acid, C6H5COOH, melts at 122.4 ̊C. If the enthalpy of fusion of this compound is 17.3 kJ/mol, what is its entropy of fusion? ...

Solved • Aug 8, 2017

Entropy

Q. Which of the following reaction(s) is/are predicted to have favorable ∆S ̊rxn? a) N2 (g) + 3 H2 (g) → 2 NH3 (g) b) H2O (l) → H2O (s) c) C6H12O6 ...

Solved • Aug 8, 2017

Entropy

Q. HI has a boiling point of –35.4 oC with a standard enthalpy of vaporization of 21.16 kJ/mol. Calculate the standard entropy of vaporization of HI. ...

Solved • Aug 8, 2017

Entropy

Q. The enthalpy of vaporization of acetone is 31.3 kJ/mol, and its boiling point is 56.3°C. What is the entropy change for the vaporization (boiling) ...

Solved • Jun 30, 2017

Entropy

Q. A system releases 900 J of heat to the surroundings, which are at a constant 27 ◦C. What is ∆S of the surroundings? 1. 33.3 J · K−1 2. −3 J · K−1...

Solved • Jun 22, 2017

Entropy

Q. Calculate the standard entropy of fusion of ethanol at its melting point 159 K. The standard molar enthalpy of fusion of ethanol at its melting poi...

Solved • Jun 22, 2017

Entropy

Q. Which of the following would probably have a positive ∆S value? 1. O2(g) → O2(aq) 2. He(g, 2 atm) → He(g, 10 atm) 3. 2 NO2(g) → N2O4(g) 4. 2 Ag...

Solved • Jun 22, 2017

Entropy

Q. In which example does entropy increase? I. A piece of fruit freezes in liquid nitrogen. II. Librarians put library books back onto shelves at the...

Solved • Jun 21, 2017

Entropy

Q. Calculate the normal boiling point of chloroform given that the standard entropy and enthalpy of vaporization of chloroform is +93.7 J/K/mol and 31...

Solved • Jun 21, 2017

Entropy

Q. Predict the sign on ΔS° for the following reactionsi. 2 KClO4 (s) → 2 KClO3(s) + O2(g)ii. Propanol condenses at room temperatureiii. CH4(g) + 2 O2(...

Solved • Apr 26, 2017

Entropy

Q. Of the following descriptions, how many (the total number) would increase entropy? Sublimation of sodium; C2H6 (g) → C2H2 (g) + 2 H2(g); Heating h...

Solved • Apr 20, 2017

Entropy

Q. How many of the following processes represent an increase in entropy:* Water is heated in the microwave from 23 Celsius to 90 Celsius* The sublimat...

Solved • Apr 20, 2017

Entropy

Q. Balance the following reaction and then solve for the ∆S (J/K-mol) for this reaction. Li (g) + H2(g) → LiH (s) With S° (J/K-mol) value of LiH = 2...

Solved • Apr 20, 2017

Entropy

Q. Benzene has a ΔHvap = 33.90 kJ/mol and a ΔSvap = 96.4 J/mol-K. What is the vaporization temperature of Benzene in Celsius? A. −273 B. 78.5 C. 35...

Solved • Apr 20, 2017

Entropy

Q. HI has a normal boiling point of -35.4°C, and its ΔHvap is 21.16kJ/mol. Calculate the molar entropy of vaporization (ΔSvap).A. 68.6 J/K • molB. 0.0...

Solved • Mar 6, 2017

Entropy

Q. Which of the following species has the highest entropy (S°) at 25°C?A. MgCO3(s)B. CO(g)C. H2O(l) D. CO2(g)E. CH3OH(l)

Solved • Mar 6, 2017

Entropy

Q. Rank the following compounds in order of increasing entropy at 25°C?A. MgCO3 (s)B. CO (g)C. Ni (s)D. H2O (I)E. CH3OH (I)

Solved • Feb 20, 2017

Entropy

Q. Which of the following phase changes is correctly paired with the sign of its change in entropy and its change in enthalpy?

Solved • Feb 16, 2017

Entropy

Q. True or false: An endothermic process increases the entropy of the surroundings. ________

Solved • Dec 14, 2016

Entropy

Q. Would you expect the entropy of the system to  increase or decrease for each of the following processes: a. N2 (g) + 3H2 (g) → 2NH3 (g)       ____...

Solved • Dec 14, 2016

Entropy

Q. Would you expect the entropy of the system to  increase or decrease for each of the following processes: a. CaCO3 (s) → CaO (s) + CO2 (g)       __...

Solved • Dec 14, 2016

Entropy

Q. Consider the following figure of four processes from the initial state. The substances are in gas phase initially. Which process(es) would result i...

Solved • Nov 10, 2016

Entropy

Q. Which of the following processes involves a decrease in entropy?a. the decomposition of NH 3 (g)b. the condensation of steamc. the sublimation of C...

Solved • Sep 22, 2016

Entropy

Q. How does the standard entropy of a substance depend on its molar mass? On its molecular complexity?

Solved • Sep 9, 2016

Entropy

Q. Calculate ΔS°rxn for the following reaction. The S° for each species is shown below the reaction. C2H2(g) + H2(g) → C2H4(g) S°(J/mol·K)          ...

Solved • Aug 29, 2016

Entropy

Q. Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 398 K. Predict whether or not this reac...

Solved • Aug 29, 2016

Entropy

Q. Place the following in order of increasing molar entropy at 298 K. CO2          C 3H 8             SO A) CO2 < C3H8 < SO B) C3H8 < CO2 ...

Solved • Aug 29, 2016

Entropy

Q. Which of the following processes shows a decrease in entropy of the system? A) CH3OH(l) → CO(g) + 2H2(g) B) COCl2(g) → CO(g) + Cl2(g) C) 2 NO(g)...

Solved • Aug 29, 2016

Entropy

Q. Identify the change in state that  DOES NOT have an increase in entropy of the system. A) water evaporating B) water boiling C) ice melting D) ...

Solved • Aug 29, 2016

Entropy

Q. Calculate ΔS°rxn for the following rreaction. The S° for each species is shown below the reaction.                          H   2      +     Cl 2(...

Solved • Aug 28, 2016

Entropy

Q. Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 398 K. Predice whether or not this reac...

Solved • Aug 28, 2016

Entropy

Q. Place the following in order of increasing molar entropy at 298 K. [Least (left) - Most (right)]     C(s)           O2(g)         Ne (g) A) C(s) ...

Solved • Aug 28, 2016

Entropy

Q. Which of the following processes is accompanied by a decrease in entropy of the system? A) C6H12O6(s) → 3CH3OH(l) + CO(g) + 2C(s) B) Ni(s) + 4CO(...

Solved • Aug 28, 2016

Entropy

Q. Identify the change in state for which there is an increase in the entropy of the system.A) water condensingB) crystallization of NaCl(s); NaCl(aq)...

Solved • Aug 28, 2016

Entropy

Q. Elemental boron can be forrmed by reaction of boron trichloride with hydrogen.  BCl3(g) + 1.5H2(g) → B(s) + 3HCl(g) Substance:    BCl3(g)       H...

Solved • Aug 27, 2016

Entropy

Q. Determine ΔS° for the reaction SO3(g) + H2O(l) → H2SO4(l).                  S° (J/K•mol) SO3(g)         256.2 H2O(l)         69.9 H2SO4(l)     ...

Solved • Aug 27, 2016

Entropy

Q. Which responses include all of the following processes that are acccompanied by an increase in entropy? 1. I2(s) → I2(g) 2. 2I(g) → I2(g) 3. 2NH...

Solved • Aug 27, 2016

Entropy

Q. Which of these species has the highest entropy (S°) at 25°C? A) CH3OH(l) B) CO(g) C) MgCO3(s) D) H2O(l) E) Ni(s)

Solved • Aug 27, 2016

Entropy

Q. What are the signs for the change in enthalpy and change in entropy when a system undergoes the phase transition of freezing?A. ∆H < 0 , ∆S <...

Solved • Aug 15, 2016

Entropy

Q. Which of the following statements describes situations where entropy increases: I. Increase in number of gas particles present II. Separated gas ...

Solved • Aug 9, 2016

Entropy

Q. Consider the reaction of N2O5 at 25°C for which the following data are relevant: 2 N2O5 (g) → 4 NO2 (g) + O2 (g) Substance             ΔH°f      ...

Solved • May 17, 2016

Entropy

Q. Which of the following processes would have a positive ΔSsys value? (a) He(g), 2 atm → He(g), 10 atm (b) 2 NO2(g) → N2O4(g) (c) H2(g) + I2(s) → ...

Solved • May 17, 2016

Entropy

Q. Which of the following has the greatest entropy, S? (a) 1.00 mole of liquid water at 30° C (b) 1.00 mole of water vapor at 30° C (c) 1.00 mole o...

Solved • May 17, 2016

Entropy

Q. The diagram below shows the variation in entropy with temperature for a substance that is a gas at the highest temperature depicted. Accordingly, w...

Solved • May 17, 2016

Entropy

Q. Rank the standard molar entropy of the following from lowest to highest. 1. H2O2 (l) 2. H2O (g) 3. H2O (l) 4. H2O2 (aq) a) 4 < 1 < 3 &lt...

Solved • May 17, 2016

Entropy

Q. Consider the following processes (at 298 K) given below and determine for which is ΔS positive?

Solved • May 17, 2016

Entropy

Q. For which reaction, carried out at standard conditions, would both the enthalpy and entropy changes drive the reaction in the same direction? a) 2...

Solved • May 9, 2016

Entropy

Q. In which process is entropy decreased ? a) dissolving sugar in water b) expanding a gas c) evaporating a liquid d) freezing water

Solved • May 9, 2016

Entropy

Q. For which of these processes is the value of Δ S expected to be negative? I. Sugar is dissolved in water. II. Steam is condensed. III. CaCO3 is ...

Solved • May 9, 2016

Entropy

Q. In which of the following processes do the molecules become more orderly?A) Water evaporatingB) Water freezingC) Ice meltingD) Salt dissolving in w...

Solved • Apr 28, 2016

Entropy

Q. For which process is the entropy change per mole the largest at constant temperature?  (A) H2O(l) → H2O(g) (B) H2O(s) → H2O(g) (C) H2O(s) → H2O(...

Solved • Apr 26, 2016

Entropy

Q. One of the major sources of NOx compounds in our atmosphere is the reaction between nitrogen and oxygen, for example N2(g) + 2O2(g) → 2NO2(g) Thi...

Solved • Apr 18, 2016

Entropy

Q.  Explain the following plot:

Solved • Apr 15, 2016

Entropy

Q. Calculate the change in the standard entropy of the system, ΔS°, for the synthesis of ammonia from N2(g) and H2(g) at 298 K.  S° (N2) = 191.5 J/mo...

Solved • Apr 13, 2016

Entropy

Q. Predict the sign of ΔS for each of the following: a) A piece of wax melting b) Silver chloride precipitating from solution c) Alcohol evaporatin...

Solved • Apr 13, 2016

Entropy

Q. Predict which substance in each pair has the greater molar entropy: a) butane, CH3CH2CH2CH3 or 2-butene, CH 3CH=CHCH3 b) Ne (g) or Xe (g) c) CH4...

Solved • Apr 13, 2016

Entropy

Q. Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 298 K.   N2(g) + 2 O2(g) → 2 NO2(g) Δ...

Solved • Apr 11, 2016

Entropy

Q. Which reaction is/are predicted to have a negative entropy of reaction? a) CH3CH2OH (s) → CH3CH2OH (l) b) CH3CH2OH (l, 10 ̊C) → CH3CH2OH (l, 50 ̊...

Solved • Mar 31, 2016

Entropy

Q. Which of the following reaction(s) is/are predicted to have favorable ∆S°rxn? a) N2 (g) + 3 H2 (g) → 2 NH3 (g) b) H2O (l) → H2O (s) c) C6H12O6 (...

Solved • Mar 31, 2016

Entropy

Q. HI has a boiling point of –35.4°C with a standard enthalpy of vaporization of 21.16 kJ/mol. Calculate the standard entropy of vaporization of HI.a)...

Solved • Mar 31, 2016

Entropy

Q. Consider the following processes (Treat all gases as ideal). 1. Nitrogen gas is compressed isothermally to one half its original volume. 2. Carbo...

Solved • Mar 29, 2016

Entropy

Q. Consider the following reaction at constant pressure. Use the information here to determine the value of ∆Ssurr at room temperature. Predict whethe...

Solved • Mar 16, 2016

Entropy

Q. Which one of the following reactions is likely to have a ΔS° close to zero (in other words, neither positive nor negative)? a) PCl 3(g) + Cl2(g) ⇌...

Solved • Mar 9, 2016

Entropy

Q. Which one of the following reactions is most likely to have a positive ΔS°? a) Cu2+ (aq) + 4 Cl -  (aq) → CuCl42-(aq) b) SiH4 (g) + 2O2 (g) → SiO...

Solved • Mar 9, 2016

Entropy

Q. Which of the following statements describes situations where entropy increases:                                     I.  Increase in number of gas ...

Solved • Mar 8, 2016

Entropy

Q. Which of the following statements describes situations where entropy increases: I.  Increase in number of gas particles present II.  Separated ga...

Solved • Mar 7, 2016

Entropy

Q. Consider the reaction of N2O5 at 25°C for which the following data are relevant: 2 N2O5 (g) ⇌ 4 NO2 (g) + O2 (g) What is ΔS° for the reaction (in...

Solved • Feb 21, 2016

Entropy

Q. For the dissociation reaction of the acid HFHF ⇌ H+ + F -ΔS is observed to be negative. The BEST explanation for this is:A. This is the expected re...

Solved • Feb 21, 2016

Entropy

Q. Which of the following processes result(s) in an increase in the entropy of the system? All systems are closed systems.  

Solved • Feb 21, 2016

Entropy

Q. When an aqueous solution containing Al 3+ at 25°C is mixed with an aqueous solution of hydroxide at 25°C an immediate precipitate of insoluble alum...

Solved • Feb 21, 2016

Entropy

Q. Which of the following has the smallest molar entropy at 298 K? 1. Ne(g) 2. F2(g) 3. N2(g) 4. Cl2(g) 5. He2(g)

Solved • Feb 21, 2016

Entropy

Q. Why does the solubility of NaCl only increase slowly with water temperature?A. ΔSsol > 0 but small in magnitudeB. ΔSsol < 0 but small in magn...

Solved • Feb 21, 2016

Entropy

Q. Ce2(SO4)3 becomes less soluble in water as temperature increases because it has a negative entropy of solvation. Most other salts become more solub...

Solved • Feb 11, 2016

Entropy

Q. Arrange the following substances in the order of increasing entropy at 25° C.               CO 2 (s)         Kr (g)         S  8 (s)         O 3 ...

Solved • Feb 2, 2016

Entropy

Q. Which of the following reactions would be entropically favored?   A) Precipitation of ions from a supersaturated solution. B) Deposition of gase...

Solved • Feb 2, 2016

Entropy

Q. Coal is a major source of energy that can be converted from its solid, raw form to a gaseous phase of fuel. This is accomplished by the water gas r...

Solved • Feb 2, 2016

Entropy

Q. When temperature is increased and pressure is held fixed across a phase change which of the following statements is true? A. Entropy is negative a...

Solved • Feb 2, 2016

Entropy

Q. Which of the following would have the   highest value of absolute entropy per mole? a) Water at 50 oC b) Water at 10 oC c) Ice at -10 oC d) 1 M...

Solved • Feb 2, 2016

Entropy

Q. Which of the following processes have a positive entropy term?   A. Synthesis of ammonia from nitrogen and hydrogen gas. B. Creation of sodium b...

Solved • Feb 2, 2016