SAMPLE BEFORE HEATING 2 (B) 8 The particle diagrams above represent a change in physical state that occurred after heating two separate solid samples of a diatomic element. Which of the following best compares the relative magnitude of AS and gives the sign for the entropy change undergone by each sample, and why? (A) AFTER HEATING AS sample 1, because the changes The entropy values for both samples are positive and AS sample 2 = AS sample 1, because the changes observed for both samples required a net input of energy from the surroundings. The entropy values for both samples are negative and AS, observed for both samples released energy to the surroundings. The entropy values for both samples are positive and AS, sample 2 AS sample 1, because the change in the spatial distribution of the molecules was greater for sample 2 than for sample 1. The entropy values for both samples are negative and AS, sample 1, because the change in the spatial distribution of the molecules was greater for sample 2 than for sample 1. (C) (D) sample 2 AS sample 2 =

SAMPLE BEFORE HEATING 2 (B) 8 The particle diagrams above represent a change in physical state that occurred after heating two separate solid samples of a diatomic element. Which of the following best compares the relative magnitude of AS and gives the sign for the entropy change undergone by each sample, and why? (A) AFTER HEATING AS sample 1, because the changes The entropy values for both samples are positive and AS sample 2 = AS sample 1, because the changes observed for both samples required a net input of energy from the surroundings. The entropy values for both samples are negative and AS, observed for both samples released energy to the surroundings. The entropy values for both samples are positive and AS, sample 2 AS sample 1, because the change in the spatial distribution of the molecules was greater for sample 2 than for sample 1. The entropy values for both samples are negative and AS, sample 1, because the change in the spatial distribution of the molecules was greater for sample 2 than for sample 1. (C) (D) sample 2 AS sample 2 =

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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(Q68) Using the tabulated values from the text (located in Appendix G, beginning at p. 1211) calculate (and report in J/K) the standard entropy of reaction (AS°rxn) for the formation of gaseous nitric acid from its elements as indicated in the following balanced chemical equation: H2 (g) + N2 (g) + 3 O2 (g) --> 2 HNO3 (g)
b) Further predict the sign of change in entropy with proper explanation for the following cases. (i) Isothermal expansion of a perfect gas(ii) Cleaning the room with a vacuum cleaner
B and C only
Calculate the entropy change of formation for C6H12O6 if the reaction C6H12O6(s) + 6 O₂(g) →6 CO2(g) + 6 H₂O(g) Given AS for O₂ (g) is 205.138 J/mol K, for CO₂(g) is 213.74 J/mol K, for H₂O(g) is 188.825 J/mol K and the AS-60.4 J/K. 1282,44 + 1132.95 AS system = ≤nsº product-5 ns²
(a) In a chemical reaction 3 moles of one gas and 2 moles of a second gas react to form 5 moles of a third gas. Would you expect AS to be positive, negative, or close to zero for this reaction? AS for this reaction should -Select- v (b) In which of the processes described below should the entropy increase? Choose all of the correct possibilities. O ice cubes melting at -5 °C and 1 atm pressure O the reaction of sodium metal with chlorine gas to form solid sodium chloride Oformation of CH4(9) and O₂(g) molecules from CO₂(g) and H₂O(l) at room temperature and 1 atm pressure O a spark causes hydrogen and oxygen gases mixed in a balloon to react explosively separating a mixture of nitrogen and oxygen gases into pure nitrogen and pure oxygen
8) a) Calculate AS°en for the following reaction given their respective standard molar entropy values. С-H- (6) + н, (в) сH. (8) S°(C,H2) = 200.9 J/mol K S°(H2) = 103.7 J/mol K S°(C;H4) = 219.3 J/mol K b) the reaction in 'part a' is endothermic, when would it be spontaneous?
For each of the following pairs of substances, determine which has the larger molar entropy at 298 K: (A) Br2(l) or (B) Cl2(g) (C) Fe(s) or (D) Ni(s) (E) C2H4(g) or (F) C2H6(g) (G) CH4(g) or (H) CCl4(g) (I) MgO(s) or (J) HgO(s) (K) NaCl(aq) or (L) MgCl2(aq)