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A common commercial process for the production of so-called "Electronic Grade Silicon" (EGS) is the Siemens process (see figure below). EGS is of ultra-high purity, enough to be used for fabrication of microchips. The Siemens process is a chemical vapor deposition (CVD) reactor. In CVD, feed gases pass over a heated substrate and decompose to deposit a thin solid film on the substrate. In the Siemens process, a chamber contains a heated silicon rod. An ultra-high purity gas mixture of trichlorosilane and hydrogen flows over the rod. Pure silicon deposits on the rod as a poly-crystalline solid. (Single crystals of silicon, needed for microchip fabrication, are later made by melting the EGS and drawing a single crystal from the melt.) The CVD reaction is H2(gas) + SiHCl3(gas) = Si(solid) + 3HCl(gas) The rod initially has a mass of 1460 g and the mole fraction of hydrogen in the reactor feed and the exit gas is 0.580 and 0.223, respectively. The feed enters at a rate of 6.22 Kmol/hr. Assuming steady-state, what will be the mass of the rod at the end of 20 mins?
You purchased a machine 5 years ago for $100,000 and now the machine costs $135,000. What is the average annual inflation rate for this machine
Consider a system that consists of 4 devices. The probabilities of failure for each of the devices are, respectively: 10%, 25%, 20%, and 30%. (a) If these components were in series, what is the probability that the system operates
Conduct either a qualitative or quantitative risk assessment on this project. Identify the risk factors that you consider most important for the suspension bridge construction. How would you assess the riskiness of the project? Why?
A gas occupise 250 ml and it's pressure is 550mm Hg @ 254C how many moles of gas are in this sample? (convert mm Hg to atm).
Plot the magnitude of the force exerted on the gate by the brace as a function of the angle of the gate, , for . Assume the weight of the gate is negligible.
Sewage flows through a 12" diameter pipeline then through an 18" diamenter pipeline. The flow is the same (unknown) value in each pipe, and the slope is the same (unknown) contant value for both pipes.
A body slides down a frictionless plane and during the third second after starting from rest if it travels 20.4m. What is the angle of inclination of the plane?
A conical tube of length 8 m fixed vertically with its smaller end upwards. The velocity head and pressure head at upper ends are 1.27 m and 2.50 m respectively. The velocity head and pressure head at lower ends are 0.203 m and 5.407 m respectivel..
at one point on the highway, a 720 ft equal-tangent crest vertical curve exists. measurements show that at 3+40 stations from the PVC, the vertical curve offset is 3.5 ft. assess the adequacy of this existing curve in light of the reconstruction d..
5 Kg of water at 1.2 MPa, 120oC is contained in a frictionless piston-cylinder device. The water is heated until its temperature reaches 250oC. a) a)Determine the work performed in kJ
the flow rate into the lake is 10 m3/s, the surface area of the lake is 1 x 107 m2, and the rate of evaporation from the lake is 6 cm/wk, how long ago did the dumping stop?
The Earth may be considered as a sphere whose diameter is 8000 mi. and whose density is roughly approximated to be 6560 kg/m^3. What is the mass of the Earth in pound-mass and kilograms
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