Question

(3) Use the vapor pressures for tetrachloromethane given in the following table to estimate the temperature and pressure of the triple point and also the enthalpies of fusion, vaporization and sublimation. Solid 230 225.7 280 340 6440 62501 Liquid 4) Calculate the change in the freezing point of water at 100. and 500. bar compared to that at 1 bar assuming that the density of the liquid and solid phases remain constant at 997 and 917 kg m, respectively. Explain why your answer is positive (or negative). (5) Freeze-drying occurs when vapor (and thus heat) is removed from a liquid Assuming the vapor pressure of H2O remains constant as it cools, estimate the mass of ice that will form as H20 vapors are pulled off of 500.0 g of H2O () starting at 25.0° (6) In vacuum distillation, the surrounding pressure inside a chamber is lowered so the solvent boils at a lower temperature. This is useful when isolating compounds that are temperature sensitive. To what pressure must a chamber be reduced to distill methanol at 25.0°C?

Answer 1

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