Construct the phase diagram for for gold and thallium. Pure gold melts at 1063°C and pure thallium melt at 302°C, respectively and a eutectic composition between 20 and 30 wt-% Au is found with a melting point of 128°C. (a) Identify the eutectic composition (b) For each region, identify the number of phases and the solid that separates out, if any. (c) Find the composition(s) at ZA = 60 wt-% Au at 400°C! (d) What is the ratio of amounts in the phases for the point in (c)? - (e) For a composition(s) of ZA 20 wt-% Au, heat the sample from the 0°C to 400°C; for each phase transition describe the number of phases, composition of each phase and relative amounts at the start and end point, before and after the phase transition. Composition, wt-% Au 10 20 30 40 60 80 90 Melting T (°C) 272 204 200 400 686 910 998

Construct the phase diagram for for gold and thallium. Pure gold melts at 1063°C and pure thallium melt at 302°C, respectively and a eutectic composition between 20 and 30 wt-% Au is found with a melting point of 128°C. (a) Identify the eutectic composition (b) For each region, identify the number of phases and the solid that separates out, if any. (c) Find the composition(s) at ZA = 60 wt-% Au at 400°C! (d) What is the ratio of amounts in the phases for the point in (c)? - (e) For a composition(s) of ZA 20 wt-% Au, heat the sample from the 0°C to 400°C; for each phase transition describe the number of phases, composition of each phase and relative amounts at the start and end point, before and after the phase transition. Composition, wt-% Au 10 20 30 40 60 80 90 Melting T (°C) 272 204 200 400 686 910 998

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

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 128IP: Some nonelectrolyte solute (molar mass = 142 g/mol) was dissolved in 150. mL of a solvent (density =...

See similar textbooks

Similar questions

BINARY PHASE DIAGRAMS Please answer ALL parts with as much explanation as possible, showing full working out.a)(i) What is the melting point of pure Mg?(ii) What is the maximum solubility of Mg in Pb and at what temperaturedoes this occur? (b) A 50 wt.% Pb-50wt% Mg alloy is slowly cooled from 700 °C to 400 °C.(i) At what temperature does the first solid phase form?(ii) What is the composition of this solid phase?(iii) At what temperature does all the liquid solidify?(iv) What is the composition of the last remaining liquid phase?(v) What is the freezing range? (c) What is the mass fraction of solid and liquid of a 60 wt.% Mg alloy at atemperature of 500 °C.(d) Draw and label the microstructure of an 80 wt.% Mg alloy at 600 °C.(e) A Mg-Pb alloy of mass 5.5 kg has a composition just slightly below thesolubility limit of 200 °C.(i) What mass of lead is in the alloy?(ii) If the alloy is heated to 350 °C how much more lead can be dissolvedin the α phase without exceeding the solubility…
The ceramic materials alumina (Al2O3) and chromium oxide (Cr2O3) form an isomorphic phase diagram. The solubility will be(a) unlimited of one ceramic in the other.(b) very limited depending on the weight % of Al2O3(c) very limited depending on the weight % of Cr2O3(d) partial of one ceramic in the other.
Calculate the phase diagram of the forsterite (Mg2SiO 4) fayalite (Fe2SiO4) system, assuming solid solution between the two phases, complete mixing in the liquid, and DHmelting = 14 kcal/mol for each phase. The respective melting temperatures of the two phases are 2163 K (forsterite) and 1478 K (fayalite). Sketch your phase diagram.
Answers must be typed out, using units, in the simplest logical manner EXPLANATION CANNOT BE HAND-DRAWN Phase Diagram for CO2The phase diagram for CO2 is shown in Figure 17-38 . (a) What is the phase of CO2 at T=20°C and P=500 kPa? (b) What is the phase of CO2 at T=−80°C and P=120 kPa? (c) For reasons of economy and convenience, bulk CO2 is often transported in liquid form in pressurized tanks. Using the phase diagram, determine the minimum pressure required to keep CO2 in the liquid phase at 20 °C.
Please help with some explanation
Question attached
The partial molar volumes of water and ethanol in a solution with H₂O are 17.0 and 57.0 cm³.mol-¹, respectively. Part A AV = Calculate the volume change upon mixing sufficient ethanol with 6.50 mol of water to give this concentration. The densities of water and ethanol are 0.997 and 0.7893 g-cm-³, respectively, at this temperature. Express your answer to two significant figures and include the appropriate units. Submit 17 μA 3 cm³ Previous Answers Request Answer ? = X Incorrect; Try Again; One attempt remaining 0.45 at 25 °C ANSWER 1: Deduction: AV = 0.314 L ANSWER 2: Deduction: AV = 0.31 L ANSWER 3: Deduction: AV = 17 L ANSWER 4: Deduction: AV = 17 cm³ ANSWER 5: Deduction: AV = -17 cm³
ST4D.3 - The vapor pressure of a substance at various mole fractions in a mixture were found to be as follows. Estimate the Henry's law constant [in MPa] for the substance for the particular solvent of this mixture. USE ALGEBRA instead of a graphical approach. Don't forget there's one more data point that isn't listed in the table (the origin). 0.00230.01020.0182 99.7 48.8 |P/КРа 27.7 Type your answer...
Kf kb 2….(3rd attempt)
Give detailed Solution asap
Refer to Fig. 4A.8. Describe the phase or phases present as the pressure on a sample of CO2 is steadily increased from 0.1 atm: (a) at a constant temperature of 200 K; (b) at a constant temperature of 310 K; (c) at a constant temperature of 216.8 K.
Uranium tetrafluoride and zirconium tetrafluoride melt at 1035 °C and 912 °C respectively. They form a continuous series of solid solutions with a minimum melting temperature of 765 °C and composition x(ZrF4) = 0.77. At 900 °C, the liquid solution of composition x(ZrF4) = 0.28 is in equilibrium with a solid solution of composition x(ZrF4) = 0.14. At 850 °C the two compositions are 0.87 and 0.90, respectively. Sketch the phase diagram for this system and state what is observed when a liquid of composition x(ZrF4) = 0.40 is cooled slowly from 900 °C to 500 °C.