Sublimation is preferred for small scale purification as compared to crystallization because there is little loss of material during transfer True, sublimation guarantees a 100% yield False, the crystallization process is better because it yields a much purer product especially in small scale purification processes True, sublimation has less loss of material because the process has no intermediate liquid stage False, sublimation is better for large scale purification processes.

Sublimation is preferred for small scale purification as compared to crystallization because there is little loss of material during transfer True, sublimation guarantees a 100% yield False, the crystallization process is better because it yields a much purer product especially in small scale purification processes True, sublimation has less loss of material because the process has no intermediate liquid stage False, sublimation is better for large scale purification processes.

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter6: Equilibria In Single-component Systems

Section: Chapter Questions

Problem 6.25E: 6.25. Phosphorus exists as several allotropes that have varying properties. The enthalpy of...

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Why would industry prefer to purify solids by sublimation or zone refining rather than recrystallization? (Hint: is there anything wasteful about recrystallization)
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why crystallization is considered as a First-order Phase transition?
(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.
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( الإنجليزية It is preferable to use the conical beaker for the crystallization process
Below is the phase diagram for carbon dioxide. pressure (105 Pa) 10000 solid 1000 100 10 1 3 liquid supercritical state critical point gas triple point 200 250 300 400 http://phucperiments.eu/ are the conditions in which carbon dioxide sublimates are the conditions in which carbon dioxide melts [Select] [Select] At 100 Pa and 270 K, carbon dioxide is a [Select] 350 temperature (K)
1.At -185°C and 1 atm ethane (MW = 30.07 g/mol) exists as a solid with a FCC structure. Using the data provided below: E/k=194.1K, bo=0.1794 m3/kmol Determine the diameter of one molecule of ethane (in angstroms). 2. What is the void fraction? 3. Find the density of the solid etahne. 4. Calculate the distance of separation (in m) between two ethane molecules when the potential energy is at a minimum. 5. At the separation distance calculated in part (4), determine the minimum value of the potential energy between two molecules (in J).
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pure liquid x PB liquid x in solution Dr solid x vapor pressure liquid x in solution. (saturated at Tg) (mm) 3D TE TB1TD TB Tc temperature (°C) Figure 1. Generalized vapor pressure-temperature diagram. At what temperature range should pure x solid begin to melt if introduced with impurity y and fully melt? Te --> Tb1 Te -->Tb Tb --> Tb1 Ta --> Te
6.25. Phosphorus exists as several allotropes that have varying properties. The enthalpy of transition from white P to red P, , is . The densities of white and red phosphorus are and , respectively. At what temperature does white phosphorus become the stable phase at of pressure? Assume the formula for phosphorus is .
2. True or False. a. The relation dIn P/dT AH/RT2 should not be applied to solid-liquid transitions. b The relationdin P/DT AH/RT should not be applied to solid-vaportransitions. c The relation d In P/dT ApH/RT' should not be applied near the critical point 3. What is the effect of temperature on the vapor pressure of a liquid? 4. Some vapor pressures ofa certain substance are the following: Temp (°C) P(mmHg) 80.0 0.08880 100.0 0.2729 120.0 0.7457 140.0 1845 a. Generate the equation of the best-fit line from a plot of In P (mmnHg] vs. 1/T. b Find the average A, Hover this temperature range. c. Estimate the liquid's normal boiling point END Activity No. 3 Enthalpy of Vaparization of Water | 1