... 1300 Liquid Tie line a+ Liquid a + Liquid 1200 R- -S 20 30 40 50 Co Ca Composition (wt% Ni) (b) At point B (35 wt% Ni, 1250°C) on figure, what are the mass fraction liquid and the mass fraction solid? What is the composition of solid and liquid components? Temperature ("C)
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- iverity at Anbar Cellege for Pure Belenees Analytical Chemistry 1// 1 Stage Dr. Bashar AbdulazeeR Mahmood Peperiment of Chemistry H.W: date the Formal and Molar concentrations of the constituents in 2.30 g of ethanol (g. fw%3D ) in 3.50 litres of aqueous solution. 4) Molal concentration (Molality) m The solution concentration produce from dissolved solute (mole) in solvent (kg), molality oes not change with temperature and used for physicochemical measurements. Example: Calculate the molal concentration for solution preparing from mixing 4 g NAOH with 500 g water. W 1000 4 g 1000 Solution: Molality (m) = 0.2 m %3D M.w w (g) 40 g/mol 500 (5) Concentration by percent Chemists frequently express concentrations in term of percentage Common methods include: a. Weight percent (w/w): It is the number of grams of solute per g of solvent or solution (w/w) E-) w of solute (g) w of solution or sample (g) w of solute (mg) w of solution or sample (mg) -%- %3D x 100 = %3D X 16. Using phase diagram for the mixtures of benzene and ethylbenzene shown below, estimate: Benzene / Ethybenzene at 1.00 atm By NRTL A) Boiling point of pure ethylbenzene 140- 135- 130- B) Boiling point (Tpp) of solution with molar fraction of benzene 0.3. 125 120- 115 110- C) Composition of vapor phase (molar fractions of both liquids) above the solution with molar fraction of benzene 0.3 at Töp. 105- 100 90 85 80- 75- a1 02 03 04 05 06 0.7 0.8 09 Benzene Mole Fracfioni3.9 A solution of carbon in c.c.p. iron has a density of 8.142 Mg m-³ and a lattice parameter of 3.583 Å. The solution contains 0.8% by weight of carbon. Is it an interstitial or a substitutional solid solution? At wts.: Fe = 55.85, C = 12.01. Mass of H atom = 1.66×10-27 kg
- PROVIDE HANDWRITTEN SOLUTION PLEASE Given a multi-component mixture of the following with a temperature of 70°C: hexane (1) = 0.25 ; ethanol (2) = 0.40 ; methylcyclopentane (3) = 0.20 ; benzene (4) = 0.15 Determine the following: a.) vapor phase composition Yi b.) fugacity coefficient Þi Vi P c.) activity coefficient d.) PressureReferring to the Al-Si Eutectic diagram discussed on the Phase Diagrams-Lever Rule handout, calculate the mass fraction of the phase, silicon, given a sample with 51.7 wt% aluminum at 576.99 ˚C.(b) TABLE 3 shows data phase equilibrium diagram for carbon dioxide. TABLE 3 Pressure (atm) Temperature (°C) Triple point Critical point 5.2 -57 73 31 (i) Sketch a phase diagram for carbon dioxide (ii) Explain the phase changes that could possibly occur when a sample of carbon dioxide in a closed vessel under 1 atm pressure and a temperature of -78°C is pressurised isothermally to 10atm, followed by isobaric heating to 20°C.
- 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 99812 (a) (b) Describe how you can obtain the integrated form of the Clapeyron equation as below. State any assumptions you have to make. Afus H (T-T) P₂≈ P₁+ AfusV T₁ The heat of fusion (Afus H) of Hg at its normal melting point (-38.9 °C) is 2.82 cal.g¹. The densities of Hg(s) and Hg(1) at -38.9 °C and 1 atm are 14.193 and 13.690 g cm Estimate the melting point of Hg at 100 atm using the result in (a). respectively. Ans 234.8K or -38.4°Ca.) A 12 kmol liquid mixture with XSi = 0.8, xca = 0.2 at 1500oC was cooled to 1030oC. Determine the amount of liquid and pure solid Si that are in equilibrium with each other. b.) Suppose the mixture in (a) is cooled further to 900oC. how many kg of CaSi2 is formed? (Molar weights: Ca – 40 g/mol, Si – 28 g/mol) c.)At xSi = 0.694 and T = 1030oC, is the system solid, liquid, or both?
- « Chrome File Edit View History Bookmarks Profiles Tab Window Help M Chem101 Verification - ketelko X h01 Chem101 app.101edu.co 西 ☆ Update ) -phases- Question 8 of 17 Submit The following picture would be best described as s of matte laborator п you eat natter is i by mea: A) a liquid compound categorie pure sub: 42.1% ca B) a liquid mixture roperties, C) a liquid element s and com are callec D) a gaseous compound 100 know pratories. nges are c E) a gaseous mixture cury(I) oxic 1.9). Whe mpound v s is what in Silver() ch light. This ses (thosePart A Use Raoult's law to calculate vapour liquid equilibrium behaviour for a multicomponent mixture of hydrocarbons. n-pentene i-pentane 0.1 n-pentane cyclohexane Mole fraction in mixture 0.2 0.6 0.1 (a) Calculate the pressure for which the mixture boils at 40°C. (b) Calculate the boiling temperature at atmospheric pressure. (c) From part (b), calculate the composition of the vapour phase that fomms at the nomal boiling point of the mixture. 16 M. H. Khoshgoftar ManeshA 50 wt% Pb-50 wt% Mg alloy is slowly cooled from 700°C (1290°F) to 400°C (750°F).(i) At what temperature does the first solid phase form?(ii) What is the composition of this solid phase?(iii) At what temperature does the liquid solidify?(iv) What is the composition of this last remaining liquid phase?