AH Changes sign when a Click on the process is reversed displayed. The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, AH, changes sign when a process is reversed. button within the activity and analyze the relationship between the two reactions that are Consider the reaction B(s) + ¿O2(g)→B2O3(s), AH = 1270kJ What will AH be for the reaction if it is reversed? Express your answer with appropriate units.

AH Changes sign when a Click on the process is reversed displayed. The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, AH, changes sign when a process is reversed. button within the activity and analyze the relationship between the two reactions that are Consider the reaction B(s) + ¿O2(g)→B2O3(s), AH = 1270kJ What will AH be for the reaction if it is reversed? Express your answer with appropriate units.

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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Calcium carbonate decomposes according to the following reaction. ????3(?)⟺???(?)+??2(?)CaCO3(s)⟺Cao(s)+CO2(g) The tabulated data below was determined at 25 °C. CaCO3(s) CaO(s) CO2(g) Δ?∘?ΔHf∘ Δ?∘?ΔHf∘, kJ/mol -1206.9 -635.1 -393.5 ?∘S∘ ?∘S∘, kJ/(mol K) 0.0929 0.0382 0.2137 Δ?∘?ΔGf∘ Δ?∘?ΔGf∘, kJ/mol -1128.8 -603.5 -394.4 What is ΔG° at 25 °C for this reaction? Is the reaction spontaneous at 25 °C? What is ΔG° at 1000 °C for this reaction? Is the reaction spontaneous at 1000 °C? Calculate KP for this reaction at 25 °C and 1000 °C.
A student dissolves 14.0 g of sodium hydroxide (NAOH) in 250. g of water in a well-insulated open cup. He then observes the temperature of the water rise from 23.0 °C to 36.7 °C over the course of 8.4 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaOH(s) - Na (aq) + OH (ag) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. O exothermic Is this reaction exothermic, endothermic, or neither? O endothermic Oneither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the…
A student dissolves 11.9 g of sodium chloride (NaCl)in 250. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 23.0 °C to 22.0 °C over the course of 6.9 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaCl (s) - Na" (aq) + Ci¯ (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. exothermic x10 Is this reaction exothermic, endothermic, or neither? endothermic neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. kJ kJ…
Part of the industrial recovery of elemental zinc from the zinc sulfide ore is by roasting: ZnS) + O2(2) → ZnOs + SO22) AH = -879 kJ/mol Calculate the amount of heat (in kJ) released when 1.00 g of zinc sulfide reacts with excess oxygen.
For each of the following reactions, identify whether the reactants or the products would have more potential energy. + C(s) + 2H₂O(g) + 90.1 kJ → 2CO2(g) + 2H₂(9) CO(g) + H₂O(g) - 2CO₂(g) + 2H₂(g) + 41.2 kJ C₂H₂OH(I) + 30₂(9) - 2C0₂(g) + 3H₂O(g) C3H8(9) + 6H₂O(g) → 3CO₂(g) + 10H₂(g) Use the following to answer the next 3 questions. The smelting of iron occurs in a blast furnace, as represented by the following overall equation. Step I 3Fe2O3(s) + CO(g) - CO₂(g) + 2Fe3O4(s) A+H° = -47.2 kJ Step II Fe₂O4(s) + CO(g) - CO₂(g) + 3FeO(s) A,H+19.4 kJ Step III FeO(s) + CO(g) - CO₂(g) + Fe(s) AH = -11.0 kJ The molar enthalpy of reaction for Fe₂O3(s) in the reaction represented by Step I is Record your 3-digit answer. Include sign; do not include units. Potential Energy (kJ) AH-514.1 kJ Reactants ACH° +374.1 kJ Which steps in the above process can be represented by the following potential energy diagram? Select one: O Step II only O Steps I and III O Steps I, II and III O None of the above…
A student dissolves 13.2 g of sodium hydroxide (NaOH)in 300. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 21.0 °C to 33.4 °C over the course of 5.3 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaOH (s) — Na" (ад) + ОН (ад) olo You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits. Ar Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. exothermic x10 Is this reaction exothermic, endothermic, or neither? endothermic neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. kJ kJ Calculate the…
artis aal i. Based on Textbook 2.35-2.37: Orthopedic surgeons use bone “cement" to set artificial hip implants in place. This "“cement" is methyl methacrylate that is polymerized during the surgery. However, surgeons notice a substantial amount of heat evolution from the reaction. Calculate the reaction energy if a surgeon uses 20g of methyl methacrylate glue (the precursor) to set a given hip implant. The polymerization reaction is given for you. free radical CH3 c=c CH3 +CH;-C c=0 H vinyl polymerization C=0 CH3 CH3
One industrial, large-scale method for refining iron ore to elemental iron is the reaction at high temperatures with carbon monoxide. Calculate AGº for the reaction of iron(III) oxide with carbon monoxide to give elemental iron and carbon dioxide. Use data in the table below: Substance Ag(s) AgCl(s) Al(s) Al₂O3(s) C(s) (graphite) CO(g) CO₂(g) CH4(g) CH₂Cl(g) CH₂OH(1) C₂H₂(g) C₂H4(g) C₂H6(g) C₂H18(1) C₂H,OH() Ca(s) CaCO3(s) CaCl₂(s) 197.9 213.6 186.2 234.2 126.8 CO(NH,),(s) 104.6 CO(NH,),(aq) 173.8 200.8 219.8 229.5 466.9 161 Substance Ag(s) AgBr(s) AgCl(s) Al(s) Al₂O3(s) C(s) (graphite) C₂H₂(g) C₂H₂(g) C₂H6(g) C₂H Ca(s) Standard Entropies of Some Typical Substances at 298.15 K CaBr₂(s) CaCO3(s) CaCl₂(s) CaO(s) Fe₂O3(s) H₂(g) H₂O(g) H₂O(1) (J mol-¹ K-¹) 42.55 96.2 28.3 51.0 CO(g) CO₂(g) CH4(g) CH₂Cl(g) CH31(g) CH₂OH(1) CO(NH₂)2(s) (urea) CO(NH,),(aq) AG° = kJ 5.69 Ca(OH)2 (s) CaSO4(s) CaSO4 H₂O(s) CaSO4-2H₂O(s) Cl₂(g) Fe(s) 41.4 92.9 114 Substance (J mol-¹ K-¹) CaO(s) 40 Ca(OH)₂ (s)…
13. Energy is stored in the body in adenosine triphosphate, ATP, which is formed by reaction between adenosine diphosphate, ADP, and dihydrogen phosphate ions. ADP3-(aq) + H2PO42-(aq) -----> ATP4-(aq) + H2O (l) ΔH° = 38 kJ Is the reaction endothermic or exothermic?
ΔS is negative for the reaction____. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a C H (g) + 5 O (g) → 3CO (g) + 4 H O (g) b 2SO (g) → 2SO (g) + O (g) c CaF (s) → Ca (aq) + 2F (aq) d 2N (g) + 3H (g) → 2NH (g) e HO (s) → HO (g)
The standard enthalpy of formation of SnCl₂ (s) is - 340 kJ/mol and that for SnCl4 (s) is-511 kJ/mol. From these data, we can calculate that for the reaction SnCl₂ (s) + Cl₂ (g) →→SnCl4 (s), the value of AH O cannot be determined as AH, for Cl₂ (g) is not given. O equals - 851 kJ. O equals + 171 kJ. O equals - 171 kJ.
The experimental enthalpy of decomposition of H2O2 was determined using another coffee-cup calorimetry. A sample of H202 solution was placed in the calorimeter and the initial temperature of H202 solution and the calorimeter was measured. Then, KI solution was added to the solution to catalyze the decomposition of H202 to H20. This resulted to an increase of 16.9°C in the temperature. Determine the experimental enthalpy of decomposition per mole of H2O2 given the following additional information. Express your answer in kJ/mol and in 2 decimalplaces. moles H202: 0.018 mol Ccal: 54.56 J/°C mass of the solution (mainly water): 33.9 g C, of water: 4.184 J/g°C