tracer concentration as shown below. Calculate the mean residence time. 20 C (mol/m³) 10 20 t (min) a) 20 min b) 30 min c) 15 min d) 10 min

Q3. Péclet number – We've seen the Péclet number Pé = vl as a useful metric to D determine if stirring (Pé > 1) is more efficient than diffusion (Pé < 1) for mixing solutions. "Stirring" here can designate any process which applies a force on the molecules, resulting in a velocity v. a) Show that the Péclet number, like the Reynolds number, is unitless. Let's think about why scale (f) matters for mixing. 1-DNA, a DNA polymer containing 48,502 base pairs, has a diffusion coefficient of D = field of 1 V/m, we can expect 1-DNA to reach a terminal velocity of 30 nm/s. 6.4 x 10-13m²s=1. Under an electric

A recent discovery has shown the smallest size spheres examined in Station B to be useful in gold mining. As a result, their value has changed. If the mixture separated in Station B had the following composition, what would be the new value of the entire mixture?

A water droplet having a diameter of 0.10 mm is suspended in still air at 320K, 101 kPa, and 20% relative humidity. DAB ​= 0.220 cm​2​/s (a) Calculate the initial rate of evaporation of water (b) Determine the time for thewater droplet to evaporate completely

The liquid tank is shown if Figure Fi: the inlet volumetric from vate to the out let volumetric flow rate (in Put Variable) (out Put Variable) h: the height of the liquid in the tank (State variable) V the volume of the liquid in the tank A Fr (State variable the cross-sectional area of the tant (constant) vh A > Fo fo find the volumetric flow rate of water at 30 min where fo= 0.1 √h Fie 0.1 m/

Q2) A packed bed has a following properties, consist of a hollow cylindrical particles (di-6mm ,do-12mm, I=15 mm) which has a same volume of spherical pellet. Based on Ergun equation, estimates the spheresity of particle, packed bed pressure drop, minimum fluidization velocity, and maximum velocity Pe(kg/m3) m (kg/h) p (kg/m) u (cp) d(m) L(m) Emd 0.53 1600 2000 1.16 0.0182 1.25 3 0.42

The following diagram is a simplified polarization curve of Evan's diagram for a carbon steel used in a chemical factory. The corrosion current can be determined through the diagram as shown in it. Calculate the weight loss per day and per m², and the thickness abrasion per unit time (in mpy) and evaluate its classification with respect to the corrosion rate. (Fe=7.86 g/cm³) 0.1 0.0 E com Fe POTENTIAL VOLTS (SHE) -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 10-10 109 2H +2e CATHODIC Fe2 +2e ANODIC 7x10-5 H2 NON 10 10 10 10 10 CURRENT DENSITY, A/cm² COME 10 102²2

M2

10. A container is separated into two halves by a membrane. Your lab partner assistant, Thurmond, is supposed to place a MgCl2 solution on side 1 and a NaCl solution on side 2. He is then supposed to measure the rate of water movement across the membrane. Unfortunately, Thurmond is not very good about keeping complete lab notes and he has forgotten to write down some data and calculations. Using your knowledge of osmosis, complete the following table. Temperature is 15°C and the hydraulic conductivity for the membrane is 0.4 ml/atm sec. MgCl2 Concentration on Side 1 NaCl Concentration on Side 2 80 mM Osmolarity on Side 1 Osmolarity on Side 2 Difference in osmotic pressure 60 mosM across the membrane Jy 0.95 ml/sec Reflection coefficient (ơ) Direction of water movement

Q.1) In the experiment, you wrap a piece of copper wire around your magnesium strip to suspend the magnesium inside the eudiometer. Why is copper wire a good choice for this task? Group of answer choices It conducts electricity very well It reacts strongly with the acid It does not react with the acid It is much heavier than Mg   Part B) A 45 mL sample of a dry gas is collected at 380 torr and 25 °C. Calculate the volume of the gas sample (in mL) at STP.   Part C)Using the data provided in Table 3 in the handout (also provided below), calculate the vapor pressure of water at 21.0 °C. Table 3:  Vapor pressure of water at various temperatures T (˚C) P (mmHg) T (˚C) P (mmHg) T (˚C) P (mmHg) 0 4.58 16 13.63 26 25.21 5 6.54 18 15.48 28 28.35 10 9.21 20 17.54 30 31.82 12 10.52 22 19.83 40 55.3 14 11.99 24 22.38 50 92.5