Please answer fast! MISSED THIS? Read Section19.10 (Pages 881 - 884).A reaction has an equilibrium constant of 6800 at 298K. At 771 K, the equilibrium constant is 0.79.Part AFind A Hon for the reaction.Express your answer in kilojoules per mole to three significant figures.▸ View Available Hint(s)TEI ΑΣΦAHin =Submit?kJ/mol

Answered: Image /qna-images/answer/abd18b35-ebfc-43fd-849d-f0b91fce2680.jpg

MISSED THIS? Read Section 19.10 (Pages 881 - 884). A reaction has an equilibrium constant of 6800 at 298 K. At 771 K, the equilibrium constant is 0.79. Part A Find AH for the reaction. Express your answer in kilojoules per mole to three significant figures. ▸ View Available Hint(s) VG| ΑΣΦ AHin = Submit ? kJ/mol

MISSED THIS? Read Section 19.10 (Pages 881 - 884). A reaction has an equilibrium constant of 6800 at 298 K. At 771 K, the equilibrium constant is 0.79. Part A Find AH for the reaction. Express your answer in kilojoules per mole to three significant figures. ▸ View Available Hint(s) VG| ΑΣΦ AHin = Submit ? kJ/mol

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 46QRT

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When ammonium chloride is added to water and stirred, it dissolves spontaneously and the resulting solution feels cold. Without doing any calculations, deduce the signs of G, H, and S for this process, and justify your choices.
Given the following information at 25C, calculate G at 25C for the reaction 2A(g)+B(g)3C(g) Substance Hf(kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) 197 164 a 956 kJ b 956 kJ c 346 kJ d 346 kJ e 1.03 103 kJ
The reaction between magnesium metal and water (l) produces solid magnesium hydroxide and hydrogen gas. Calculate G for the formation of one mole of Mg(OH)2 at 27C and at 39C.
The overall reaction that occurs when sugar is metabolized is C12H22O11(s)+12O2(g)12CO2(g)+11H2O(l) For this reaction, H° is -5650 kJ and G° is -5790 kJ at 25°C. (a) If 25% of the free energy change is actually converted to useful work, how many kilojoules of work are obtained when one gram of sugar is metabolized at body temperature, 37°C? (b) How many grams of sugar would a 120-lb woman have to eat to get the energy to climb the Jungfrau in the Alps, which is 4158 m high? ( w=9.79103mh, where w= work in kilojoules, m is body mass in kilograms, and h is height in meters.)
A wad of steel wool (specific heat=0.45J/gC) at 25C is misplaced in a microwave oven, which later is accidentally turned on high. The oven generates microwaves of 13.5 cm wavelength at the rate of 925 moles of those photons per second. All of the photons are converted to high-heat energy, raising the temperature of the steel wool. Steel wool reacts explosively with the oxygen in the oven when the steel wool reaches 400.0C. If the steel wool explodes after 1.55 seconds, how many grams of steel wool were accidentally put into the oven?
When a fossil fuel burns, is that fossil fuel the system? Explain your answer.
Why is it usually easier to use G to determine the spontaneity of a process rather than Su ?
At 1 atm, liquid water is heated above 100C. For this process, which of the following choices (iiv) is correct for Ssurr? S? Suniv? Explain each answer. i. greater than zero ii. less than zero iii. equal to zero iv. cannot be determined
9.83 A student performing a calorimetry experiment combined 100.0 mL of 0.50 M HCl and 100.0 mL of 0.50 M NaOH in a coffee cup calorimeter. Both solutions were initially at 20.0°C, but when the two were mixed, the temperature rose to 23.2°C. (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 mL of 0.50 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why?
The enthalpy of vaporization for water is 40.65 kJ mol-1. As a design engineer for a project in a desert climate, you are exploring the option of using evaporative cooling. (a) If the air has an average volumetric heat capacity of 0.00130 J cm-3 K-1, what is the minimum mass of water that would need to evaporate in order to cool a 5 m? 5 m room with a 3 m ceiling by 5°F using this method? (b) Is this a spontaneous or nonspontaneous process?
The reaction shown below is involved in the refining of iron. (The table that follows provides all of the thermodynamic data you should need for this problem.) 2Fe2O3(s)+3C(s,graphite)4Fe(s)+3CO2(g) (a) Find H for the reaction. (b) S for the reaction above is 557.98 J/K. Find S° for Fe2O3(s). (c) Calculate G for the reaction at the standard temperature of 298 K. (There are two ways that you could do this.) (d) At what temperatures would this reaction be spontaneous? Compound Hf (kJ mol-1) S° (kJ mol-1) Gf (J mol-1 K-1) Fe2O3(s) -824.2 ? -742.2 C(s, graphite) 0 5.740 0 Fe(s) 0 27.3 0 CO2(g) -393.5 213.6 -394.4.83
Acrylonitrile is the starting material used in tire manufacture of acrylic fibers (U.S. annual production capacity is more than two million pounds). Three industrial processes for the production of acrylonitrile are given below. Using data from Appendix 4, calculate S, H, and G for each process. For part a, assume that T = 25C; for part b. T = 70.C: and for part c. T = 700.C. Assume that H and H do not depend on temperature. a. b. HCCH(g)+HCN(g)70C90CCaC2HclCH2=CHCN(g) c. 4CH2=CHCH3(g)+6NO2(g)Ag700C4CH2=CHCN(g)+6HO2(g)+N2(g)

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