A student mixes together a solution Lead (II) Nitrate with a solution of Sodium Iodide, according to the reaction below: Pb(NO.) + 2Nalo --> Pblz + 2NANO a. As the reaction occurs, the student notices that the temperature of the solution goes from 25 C to 21 C 6. What is the sign of the AS for this reaction? Justify. 7. What is the sign of the AH for this reaction? Justify.

A student mixes together a solution Lead (II) Nitrate with a solution of Sodium Iodide, according to the reaction below: Pb(NO.) + 2Nalo --> Pblz + 2NANO a. As the reaction occurs, the student notices that the temperature of the solution goes from 25 C to 21 C 6. What is the sign of the AS for this reaction? Justify. 7. What is the sign of the AH for this reaction? Justify.

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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Without doing any calculations, determine the sign of AS, for each chemical reaction. a. 2 KCIO,(s) 2 KCI(s) + 30(g) b. CH=CH;(g) + H2() CH,CH,(8) c. Na(s) + 1/2 C;(g) d. N(g) + 3 H(K) NaCI(s) 2 NH,(8)
1. A potential chemical reaction at 25.0 °C has a ΔHrxn of 147.5 kJ and a ΔSrxn of -386.9 J/K. What is the ΔGrxn in kJ. (Enter answer to 3 significant figures and include no units in your answer) Also, what is true about the potential reaction in the previous problem? a. spontaneous b. illegal c. combustive d. nonspontaneous
The reaction 2N20(g) 2N2(3) + O2(g) has AH° = -163.14 kJ. What is the value of AE for the decomposition of 112 g of N20 at 25 °C? If we assume that AH doesn't change appreciably with temperature, what is AE for this reaction at 296 °C? At 25 C: ΔΕ i kJ At 296 °C: AE = i kJ
Consider the reaction described by the chemical equation shown. C,H,(g) + H,O(1) – C,H,OH(1) AH xn = -44.2 kJ Use the data from the table of thermodynamic properties to calculate the value of ASxn at 25.0 °C. ASixn J.K-! Calculate AGixn ·
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Q3
Consider the following reactions and predict the AS°: I. C6H6(s) – C6H6(1) 2 SO2(g) + O2(g) –→ 2 SO3(g) II. AS should be negative for I and positive for II. AS® should be positive for I and positive for II. AS should be negative for I and negative for II. AS should be positive for I and negative for II.
3.
4. Predict the sign of AS for these processes: a. 2 H,(g) + 0,(g) →2 H,0(1) b. H,O(1) → H,0(s) c. CACO,(s) CaO(s) + CO,(g) d. CO,(s) → CO,(g) e. 2 C,H,(1) + 25 0,(g)16 CO,(g) + 18 H,0(1) Calculate AS, AS and AS Lniv 298 K for the reaction: 2 KCIO,(s)2 KCI(s) + 3 0,lg) suri
Use the data shown below, to calculate AH°rxn and AS°rxn at 25°C for the following reaction: 3 H₂(g) + Fe₂O₂(s) → 2 Fe(s) + 3 H₂O(g) What is the value of AGᵒrxn at 25°C? Substance: H₂(g) AHof (kJ.mol-¹) 0 So (J.K-¹.mol-¹) 130.7 Fe₂O3(s) -824.2 87.40 Fe(s) 0 27.28 H₂O(g) -241.8 188.8
c) SO d) CO 0. Sodium reacts violently with water according to the equation: 2 Na(s) +2 H;0() 2 NaOH(aq) + H:(g) resulting solution has a higher temperature than the water prior to the addition of sodium. What are the signs of AH and AS for this reaction? a) AH is negative and AS is negative. b) AH is negative and AS is positive. e) AH is positive and AS is negative. d) AH is positive and AS is positive. (END)