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Explain the effect of temperature on the extent of physical and chemical
adsorption.
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- Ethanoic acid (acetic acid) was evaporated in container of volume 21.45 cm3 at 437 K and at an external pressure of 101.9 kPa, and the container was then sealed. The mass of acid present in the sealed container was 0.0519 g. The experiment was repeated with the same container but at 471 K, and it was found that 0.0380 g of the acid was present. Calculate the equilibrium constant for the dimerization of the acid in the vapour, and the standard enthalpy of the dimerization reaction.What partial pressure of hydrogen results in a molar concentration of 1.0 mmol dm-3 in water at 25 °c?The concentration of O2 in water required to support aerobic aquatic life is about 4 .0 mg dm-3 . What is the minimum partial pressure of oxygen in the atmosphere that can achieve this concentration?
- 4) a) A reaction chamber is divided into two sections by a partition on which a valve is inserted. One section contains pure gas A and the other section has a mixture of gases A and B. What happens when the valve is opened? Explain this process in terms of chemical potential. b) The decomposition of etane into etene and hydrogen takes places at 1000 K and under 1 bar total pressure. C,H6(g) → C2H48) + H2«g) The composition of the mixture at equilibrium is as follows : H2(g): 32, C2H4(g): 32, and C,H6(g):36 (mol, %). According to the data; Calculate K, at 1000K Calculate Kp at 298.15 K, AH° = 145 kJ/mol Calculate AG° at 298.15 Ka) Give any one practical example of adsorption phenomena. b) Mention any FOUR (4) applications of adsorption in chemical analysis.What is the boiling point of bromine when the external pressure is 75 kPa?Explain the significance of the triple point?
- The size of the ionic atmosphere, called the Debye radius, is 1/K, where k is given by e? NA" 1/2 Vi K = where e is the electronic charge, NA Avogadro's constant, ɛo the permittivity of vacuum (8.854×10-12 c2.N-1.m-2), ɛ the dielectric constant of the solvent, kg the Boltzmann constant, T the absolute temperature, and I the ionic strength. Calculate the Debye radius in a 0.036 m aqueous Na2S203 solution at 25°C. (Assume the density of the solution at 25°C is 1.0029 g•cm¬3.) 4.0 ÅExplain how Matthiessen’s rule is convenient in analyzing the experimental data of potassium below 20 K.19.7 cm3 of a pure vapour, at 1.092 atm, and 99.0 °C has a mass of 0.0466g.Calculate the molar mass of the substance. ______ g/mol
- Provide a particle level explanation for the following: when the temperature of a sealed, rigid (non-flexible) container is decreased, pressure also decreases.Q. Question 3(a) Oxidised chromium Cr2O3 has a diffusion coefficient of 5 ×10−15 cm2s−1 at 730 ℃ and is 2 ×10−9 cm2s−1 at 1430 ℃. Calculate the following parameters:(i) Activation energy Q.(ii) Constant ??.(b) The material stated in Question 3(a) has its atoms transferred from one lattice position to another at a rate of 4 ×105 jumps/s at 410 ℃. Apply suitable mathematical expressions and obtain the jump rate of the material at 650 ℃.Evaluate the collision frequency of a 1:1 mixture of H2 and 02 at 1.0 atm and 25 °C. Given the radius of H atom is 1.06 x 10-10 m and the radius of O atom is 9.6 x 10-11 m. |