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- כטן ε БӘЛ (b) Adsorption of a solute can take place from the liquid surface to a solid surface when the solution is treated with a solid. Assuming that the solute adsorbs strongly compared to the solvent, sketch comparative qualitative plots of x/m (amount adsorbed /g) vs C (concentration in solution) for the individual adsorption of ethyl, n- propyl and n-butyl alcohols from an aqueous solution to a hydrophilic silica sample. Give suitable explanation for the plots. (2)What is the difference between a diffusion reaction and a diffusion-controlled reaction?A certain solid sample adsorbs 0.63 mg of CO when the pressure of the gas is 36.0 kPa and the temperature is 300 K. The mass of gas adsorbed when the pressure is 4.0 kPa and the temperature is 300 K is 0.21 mg. The Langmuir isotherm is known to describe the adsorption. Estimate the fractional coverage of the surface at the two pressures.
- For the adsorption of a substance A from aqueous solution by charcoal at 25C, the Freundlich constants are n = 3.0 and k = 0.50 for y in grams per gram and C in g L-1. What weight of A will be adsorbed by 2 g of charcoal from 1 L of a solution containing originally 2 g of substance? Answer is [1 g]2. a) Calculate the hard-sphere (HS) collision theory rate constant ks for the reaction NO(g) + C₁₂(g) Þ NOCl(g) + HS Cl(g) at 300 K in units of dm³ mols. The collision diameters of NO and Cl₂ are 370 and 540 pm, respectively. 16.0 g/mol, and mcı Use masses of m₁ = 14.0 g/mol, mo = 35.0 g/mol. N = b) Now include the line-of-centers (LOC) energy criterion to find koc in units of dm³ mol¹ s¹ using E₁ = 84.9 kJ mol LOC LOC c) Calculate the ratio of kчs and kLoc to the experimental rate constant at 300 K given A = 3.981 10° dm³ mol¹ s and E₁ = 84.9 kJ mol¹. a -1The first-order degradation rate constant k was determined to be 0.0125/day for contaminant A and 0.0030/day for contaminant B in a soil. Calculate the half-life T1/2 and the 95% dissipation time for these contaminants in the soil. Compare the persistence between the two contaminants.
- liquid phase reaction:trityl (A) + methanol (B) -> product a batch reactor was carried out at 25°C in excess solution (Cb0 = 0.5 mol/dm^3). The pyridine reacts with HCL, which then precipitates as pyridine hydrochloride making the reaction irreversible. the order of the reaction with respect to the methanol concentration (B) is order 1. The concentration of triphenyl methyl chloride (A) is measured as a function of time and is shown below. -ra = kCa x Cb it is assumed that the value of Cb is almost always constant, or Cb = Cb0-rA = kCb0 x CA^x-rA = k1 x CA^x use the integral method to ensure that the reaction is second order with respect to triphenyl methyl chlorideThe equation 96 250Cm-?+ Sr+4n is correctly completed as 96 250Cm→ 14Ce+ 2Sr+4{n. A) True B) FalseSuppose that in a certain chemical process the reaction time y (hr) is related to the temperature (°F) in the chamber in which the reaction takes place according to the simple linear regression model with equation y = 4.30-0.01x and σ = 0.08. USE SALT (a) What is the expected change in reaction time for a 1°F increase in temperature? For a 12°F increase in temperature? 1°F increase -0.01 12°F increase -0.12 hr hr (b) What is the expected reaction time when temperature is 180°F? When temperature is 260°F? 180°F 260°F 2.5 1.7 hr hr (c) Suppose five observations are made independently on reaction time, each one for a temperature of 260°F. What is the probability that all five times are between 1.56 and 1.84 hours? (Round your answer to four decimal places.) 0.307 (d) What is the probability that two independently observed reaction times for temperatures 1° apart are such that the time at the higher temperature exceeds the time at the lower temperature? (Round your answer to four decimal…
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