Indicate on the phase diagram in Fig. 5.5 the feature that denotes incongruent melting. What is the composition of the eutectic mixture and at what temperature does it melt?
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- Define eutectic point. For a binary ( two.component ) mixture of solid organic compoundsDescribe a binary eutectic diagram and show all phase regions with all the relevant information for each.Sketch the phase diagram of the sys tem NH3/N2H4 given that the two substances do not form a compound with each other, that NH3 freezes at -78 °C and N2H4 freezes at +2 °C, and that a eutectic is formed when the mole fraction of N2H4 is 0.07 and that the eutectic melts at - 80 ° C.
- How many degrees of freedom are there for an unsaturated sodium-chloride liquid-water solution, at equilibrium with ice?Sketch the phase diagram of the system NH3/N2H4 given that the two substances do not form a compound with each other, that NH3 freezes at -78.0°C, N2H4 freezes at +2.0°C, that a eutectic is formed when the mole fraction of N2H4 is 0.07, and that the eutectic melts at -80°C.5C. 2(b) Sketch the phase diagram of the system of NH/NH, given that the two substances do not form a compound; NH, freezes at -78 °C; N₂H, freezes at 2 °C; a eutectic is formed when the mole fraction of N H is 0.07; and the eutectic melts at -80 °C.
- One of the possible consequences of climate change is anincrease in the temperature of ocean water. The oceansserve as a “sink” for CO2 by dissolving large amounts of it.(a) The figure below shows the solubility of CO2 in water as a function of temperature. Does CO2 behave more or lesssimilarly to other gases in this respect?(b) What are the implications of this figure for the problemof climate change?12 (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°C(a) What is the difference between the states of phase equilibrium and metastability? (b) Explain with the aid of neatly drawn binary phase diagrams the following terms? i. Isormophous phase diagram ii. Eutectic Isotherm iii. Peritectic point
- The melting temperature of a compound A is 280K at 2kPa with an enthalpy ofmelting of 100J/mol. The density of liquid A is 0.9 g/cm 3 and of solid A of 0.8g/cm 3 .(a) What is the temperature at which liquid-solid are in equilibrium at5kPa?(b) What is the solute concentration of compound B when it is dissolvedin 100mL of liquid A? The measured osmotic pressure of the solution is 0.65kPa at25°C.(c) What is the freezing temperature of the solution when B is added?In benzene, dimerization occurs with benzene due to hydrogen bonding. In 110 g of benzene, 1.70g of acetic acid is dissolved that increases the boiling point by 0.40 oC. What is the expected degree of association of acetic acid? (Use Kb=2.57 Kg mol-1 )?Describe the molal boiling point-elevation constant for the solvent?
