Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always thermodynamically unfavourable. There is no need to do any calculation, use chemical arguments to predict the sign of the enthalpy change. N2(g) --> N2(1)

Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always thermodynamically unfavourable. There is no need to do any calculation, use chemical arguments to predict the sign of the enthalpy change. N2(g) --> N2(1)

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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Constants | Periodic Table The standard enthalpy of formation (AH;) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 °C, and all the species present at a concentration of 1 M.A"standard enthalpies of formation table" containing AH; values might Part A AN What is the balanced chemical equation for the reaction used to calculate AH; of BaCO3 (s)? If fractional coefficients are required, enter them as a fraction (1.e. 1/3). Indicate the physical states using the abbreviation (s)., (1), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution. look something like this: Substance AH Express your answer as a chemical equation. H(g) 218 kJ/mol > View Available Hint(s) H2(g) O kJ/mol Ba(s) OkJ/mol ΑΣΦ Ba (aq) -538.4 kJ/mol C(g) 71 kJ/mol C(s) O kJ/mol DA chemical reaction does inot occur for this…
G Calculate the standard enthalpy x t/tools/assessment/items/cbe78911-4d9b-4f65-9517-9afd89a26b7d/assignments/5417193?redirectBackToOnClose=true&emptyReading Tab=true&nga Resc Calculate the standard enthalpy change for the reaction at 25 °C. Standard enthalpy of formation values can be found in this list of thermodynamic properties. MgCl, (s) + H, O(1) MgO(s) + 2 HCI(g) kJ Incorrect NIKT
State the 3rd law of thermodynamics. How is it interpreted in microscopic thermodynamic sense?
Consider the two reactions. 2 NH, (g) + 3 N,0(g) → 4N,(g) + 3 H,0(1) 4 NH, (g) + 3 0,(g) 2 N,(g) + 6 H,0(1) AH° = -1010 kJ AH° = 1531 kJ Using these two reactions, calculate and enter the enthalpy change for the reaction below. N, (g) + 0,(g) → N,0(g)
Be sure to answer all parts. Use the table to caleulate AG"_ for the following reactions at 25°C. Species AG (kJ/mol) Mg(s) 0:(8) MgO(s) -569.6 SO,(8) -300.57 so,(3) |-370.53 C,H2(3) 209.2 CO2(3) -394.65 H,O() -237.35 H,O(g) -228.77 (a) 2 Mg(s) + O2(g) →2 MgO(s) kJ (b) 2 SO¿(g) + O2(g) → 2 SO3(g) kJ (c) 2 C,H¿(g) + 5 O,®) → 4 CO,(g) + 2 H,0) kJ
4. The standard enthalpies of combustion reaction at 25 °C of H2i9) , n-butane, C«H10(9) , 1- butene, C4H8(g) , and 1,3 -butadiene, C4H6(g) are -285.84 kJ/mol, -2878.6 kJ/mol, - 2718.8 kJ/mol and -2543.5 kJ/mol, respectively. Calculate AH° for the following reactions. a) C4H8(q) + H2(g). CẠH10(9) b) C4H6(a) + 2 H2(a) C4H10(a) c) CO(g)+H20(g)→CO2(g)+H2(g)
Why do standard reference values for temperature and pressure have to be selected when we consider and compare heats of reaction for various reactions? Explain by selecting all true statements. V Standards are useful so that all heats of reactions are reported at the same conditions. O In general, heats of reaction do not depend on the temperature and pressure. V In general, heats of reaction depend on the temperature and pressure. What is the value for standard temperature? °C What is the value for standard pressure? bar (or atm)
Without doing any calculations, match the following thermodynamic properties with their appropriate numerical sign for the following exothermic reaction. 250,(9) + 0,(g)2S0;(g) Clear All >0 0 low T, 0 high T
A mole of sodium met is added to water How much work is done on the atmosphere by the subsequent reaction if the temperature is 25 C°
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Which of the following describes the second law of thermodynamics?deltaS(system) + deltaS (surroundings) <0deltaS (system) - deltaS (surroundings) = 0deltaS(system) - deltaS (surroundings) <0deltaS(system) - deltaS (surroundings) > 0deltaS(system) + deltaS (surroundings) = 0deltaS (system) + deltaS (surroundings) > 0
O-234 kJ 234 kJ -150. kJ -117 kJ Given: -1835kJ AH°, AHᵒf (kJ/mol) -941 -840 QUESTION 12 Use the standard reaction enthalpies given below to determine AH°rxn for the following reaction: P4(g) + 10 Cl₂(g) → 4 PC|5(s) PC15(s) → PC13(g) + Cl₂(g) P4(g) + 6 Cl₂(g) → 4 PCl3(g) rxn IF7(g) IF 5(9) 2(g) 62.42 = ? ΔΗ° rxn AH°rxn = +157 kJ = -1207 KJ QUESTION 13 Use the AH°f and AH°rxn information provided to calculate AH°f for IF: IF7(9) + 12(g) → IF5(g) + 2 IF(g) AH°rxn = -89 kJ