Two bulbs are connected by a straight tube, 0.001 m in diameter and 0.15 m in length. Initially the bulb at End 1 contains N2 and the bulb at End 2 contains H2. Pressure and temperature are constant at 25°C and 1 atm. At a time after diffusion starts, the nitrogen content of the gas at End 1 and End 2 of the tube became 80 mol% and 25 mol%, respectively. If the binary diffusion coefficient is 0.784 cm²/s and the gas constant = 82.06 atm.cm/mol. K, determine: a. The rates and direction of mass transfer in mol/s. b. The species velocities, in cm/s, at the point (z = 0.1 m) where the molar percentages of N2 and H2 are 43.3% and 56.7, respectively. c. The molar average velocity at the point (z= 0.1 m).

One integrated circuit design calls for the diffusion of arsenic into silicon wafers; the background concentration of As in Si is 2.5 × 1020 atoms/m³. The predeposition heat treatment is to be conducted at 1000°C for 45 minutes, with a constant surface concentration of 8 x 1026 As atoms/m³. At a drive-in temperature of 1100°C, determine the diffusion time required for a junction depth of 1.2 μm. For this system, values of Qd and Do are 4.10 eV and 2.29 × 10-³ m²/s, respectively. hours

A cylindrical tube connects two large gas tanks (Tank-1 and 2). Both tanks contain mixture of carbon dioxide (CO₂) and sulphur dioxide (SO₂). The partial pressure of carbon dioxide in Tank-1 is 80 kPa and in Tank-2 is 20kPa. Both tanks and connecting tube are at 100 kPa and 263 K. The tube is 100 mm long. The diffusion coefficient of carbon dioxide is 0.064 cm²/s at 100 kPa and 263 K, and molar mass of carbon dioxide is 44 kg/kmol. Calculate the steady-state flux of carbon dioxide through the tube, assuming ideal gas is applied. 11.755 x 10-3 mol/m².s O 7.755 x 10-3 mol/m².s 4.755 x 10-3 mol/m².s 1.755 x 10-3 mol/m².s

Please help, complete solution need.

Q2:. (a) For a free electron with a velocity of lo7 cm/s, what is its de Broglie wavelength. (b) In GaAs, the effective mass of electrons in the conduction band is 0.063 mo. If they have the same velocity, find the corresponding de Broglie wavelength.

A cylindrical tube connects two large gas tanks (Tank-1 and 2). Both tanks contain mixture of carbon dioxide (CO₂) and sulphur dioxide (SO₂). The partial pressure of carbon dioxide in Tank-1 is 80 kPa and in Tank-2 is 20kPa. Both tanks and connecting tube are at 100 kPa and 263 K. The tube is 100 mm long. The diffusion coefficient of carbon dioxide is 0.064 cm²/s at 100 kPa and 263 K, and molar mass of carbon dioxide is 44 kg/kmol. Find the rate of flow of carbon dioxide in question 11 if the cross-sectional area of the tube is 4 mm². 47.02 x 10-⁹ mol/s 31.02 x 10-⁹ mol/s 19.02 x 10-⁹ mol/s 7.02 x 10-⁹ mol/s

Problem #1: Diffusion-convection problems wherein the species diffusivity is concentration-dependent often provide a differential equation of the following general form: where Cis the dimensionless concentration and z is the dimensionless distance. Assume vL/D, is a constant. Assume that C= 1 at z = 0, and C=0 when z is very large. Solve the above differential equation and provide an exact analytical equation for C=ft:). Problem #2: In a diffusion-reaction system, reactant 'A' diffuses through a porous catalyst pellet and reacts in a 1* order reaction to produce 'B'. Efficacy of the catalyst in converting 'A' to 'B' is a function of 'x' such that the mass balance equation describing the system at steady-state is: d?c Dari -kīC = 0 Cis the concentration of 'A' that varies in the x-direction, k is the 1t order reaction rate constant, and D is the diffusion coefficient of 'A'. L is the thickness of the catalyst layer, and can be treated as a constant. First, non-dimensionalize the…

A spherical mothball initially with radius, Ro, is shrinking in volume due to the sublimation of naphthalene through the air in a large room.  At room temperature (T) and pressure (PT), the naphthalene (with molecular weight as MWa) in the mothball exerts a vapor pressure (VPa).  It is of interest to investigate the rate at which the mothball is shrinking due to the diffusion of naphthalene in an air-rich environment. A. Illustrate the physical model/s that can describe the diffusion of naphthalene through the air-rich environment (room).  Indicate the control volume/s (differential volume/s) as an expression of the transfer area and distance.  Specify the components needed in establishing the shell balance.  Indicate the boundary conditions and illustrate the direction of transfer in each physical model.  Note:  Express the radial distance from the mothball surface as r, while the shrinking radius of the mothball is expressed as R.  Use and define subscripts, as necessary. B. For each…

A steel sheet is exposed to a nitrogen rich atmosphere at 900°C and achieves steady-state diffusion. The diffusion coefficient for nitrogen at this temperature is 1.85 x 10-10 m2 kg and the diffusion flux is 1.0 x 10-7 If the initial concentration of sec m².sec kg nitrogen in the steel at the high-pressure surface is 2 at what distance into the sheet m39 will the concentration of nitrogen be 0.5 *9? m3 4 360 words D Focus 255% e Type here to search IA 5:02 PM W 2/24/2022 10 165HZ V WQHD |. ROG ZEPHYRUS 100% DCI-P3 PANTONE Validated F5 F9 F10 ESC AURA DELETE %24 & %3D P www ENT G K

For each unknown liquid, predict, based upon structure, if the molecule is polar or nonpolar. Explain your answer. Research and list in a table format include the boiling points (1 atm) and heat of vaporization (at 25oC) for each substance.   Unknown Liquids: Toluene, n-Butanol, Hexane, ethylene glycol, acetone, hydrogen oxide