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- a. How much methylcellulose 1500 should be weighed? viscosity for a suspension is 750 cps. Note 25-50% of the Rx volume comes fro cherry syrup : the remainder of the volume come from the methylcellolose. b. what volume of water should be added to hydrate the methylcellulose?Briefly describe the technique for packing a capillary melting point-tubeAssume the total heat of vaporization (per gram) of water can be used to supply the energy needed to tear 1 gram of water molecules apart from each other. How much energy is needed per molecule for this purpose? Show unit analysis and conversion on solution. Round-off to four decimal place.
- The sublimation pressures of solid Cl2 are 352 Pa at -112oC and 35 Pa at -126.5oC. The vapor pressures of liquid Cl2 are 1590 at -100oC and 7830 at -80oC. Calculate (a) △subH, (b) △vapH, (c) △fusH, and (d) the triple point. Answer: [31.4 kJ mol-1 ; 22.1 kJ mol-1 ; 9.1 kJ mol-1 ; -102oC]The Molecular Weight of an unknown liquid is determined using the Dumas Method. The following data has been obtained: Atmospheric Pressure = 754.6 TorrVolume of the Flask = 213 mLTemp. of Water Bath = 100 °CMass of Re-Condensed Liquid = 0.582 g What is the Molecular Weight of the liquid?In getting/testing the surface tension of a liquid, what is the importance of collecting more than one drop of the liquid sample from the burette?
- Why would industry prefer to purify solids by sublimation or zone refining rather than recrystallization? (Hint: is there anything wasteful about recrystallization)What are other experimental methods other than the cryoscopic method by which the molecular weight of a non-volatile solid substance may be determined. Explain the process.1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?
- The surface tension between n-Hexane and water is of 52.2 erg/cm2 (erg/cm2 = dina/cm). Their densities are 0.6599 and 0.9982 g/cm3, respectively. Assuming the contact angle is zero, calculate the capillary rise of the aqueous phase if the capillary tube dimeter is 0.35 mm.Theoretically, the relative viscosity for solutions (not pure solvents) should always bea. greater than 0 b. less than 0 c. greater than 1 d. between 0 and 1If nickel atoms need to be dissolved into a copper system as a solid solution, what type of diffusion is present during processing? Discuss your answer.