Q1) i- Estimate the diffusivity of carbon oxide (CO2) in air at 330 K and 1.2 bar applying the following formula and the data given in Table Q1. (0.98 3.03 (10-3) T1.5 MO.5 AB P MO.5 oAB Np DAB 'AB where; DAB = diffusion coefficient, cm?/sec MA , MB = molecular weights of A and B, respectively T= temperature, °K P= Pressure, bar O AB= collision diameter, angstrom Np = diffusion collision integral, dimensionless Given the following: -1 МАВ 3 2 \MA MB O AB = 0.5(0A +0B) 0.5 EA EB к к E AB K II

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An Al-4.5wt%Cu alloy has a low-temperature yield stress of 600 MPa due to the precipitation strengthening effect imparted by the equilibrium q phase (Al2Cu) precipitates. Estimate the interparticle spacing and particle size in this alloy. Given: density of α-solid solution 2,700 kg/m3 and density of q phase 4,430 kg/m3. Assume the Cu content in α-solid solution 0.5 wt% and the Cu content in the q phase 54%.   Hint: You need to use the Orowan model of particle strengthening and the lever rule among other concepts.

Which of the following properties of ozone (a pollutant in the lower atmosphere but part of a protective shield against UV light in the upper atmosphere) are physical, and which are chemical? • bluish color• pungent odor• very reactive• decomposes on exposure to ultraviolet light• gas at room temperature

A 0.561 m solution of an unknown electrolyte depresses the freezing point of water by 2.93 °C. What is van’t Hoff factor for this electrolyte? The freezing point depression constant (Kf) for water is 1-86 °C kg mol-1

Ethylene (CH4) absorbs UV light of 171 nm. This absorption can cause ethylene to polymerize, turn from a liquid to polyethylene (the stuff plastic bags are made of). If you put 1757 kJ into a 171 nm laser, at most, how many grams of plastic (polyethylene) could you make?

Based on the graph below, if 70.0 g of HCI are dissolved in 100 g of water at 40 degrees Celsius is the solution saturated, unsaturated, or supersaturated? Table G Solubility Curves NANO, KI 140 130 KNO, 120 110 100 90 80 NH,CI 70 HCI 60 KCI 50 40 NaCI KCIO, 30 20 NH, 10 10 20 30 40 50 60 70 80 90 100 Temperature (°C) Solute per 100 g of H,0 (g)

Question: Consider the sugar–water phase diagram of Figure 10.1.                (a)  How much sugar will dissolve in 1000 g of water at 80°C (176°F)?                (b)  If the saturated liquid solution in part (a) is cooled to 20°C (68°F), some of the sugar will precipitate out as a solid.  What will be the composition of the saturated liquid solution (in wt% sugar) at 20°C?                (c)  How much of the solid sugar will come out of the solution upon cooling to 20°C?   Figure 10.1 is provided below.

A saturated solution containing 150 kilograms of sodium sulfate (mol. wt. = 142) in 600 kilograms of water is fed to Swenson-Walker crystallizer. The solubility of sodium sulfate at 10 °C is 9 kilogram of anhydrous salt per 100 kilogram of water, and the deposited crystals consist of the decahydrate (mol. Wt. = 322). Crystallization is by cooling at 10 °C. If 2% of the water was lost by evaporation during the cooling process, the percent (%) yield in the crystallizer is Blank 1%. **(Express your answer to two (2) decimal places. Do not put units on your answer)**