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?

Write the general mass balance equation for the rinse tank : To remove the solution containing metal from a part after plating the part is commonly rinsed with water. The rinse water is contaminated with metal and must be treated before discharge. The Shiny Metal Plating Co. The plating solution contains 85.. |

Calculate the point price elasticity of demand for the firms : Wonder bread is a normal good produced by the Wonder Bakery. Using clearly labeled Demand and Supply curves, show what will happen to the equilibrium price and quantity of Wonder bread in each of the following situations? |

At what temperature does the ball just fit through the ring : An aluminum ball does not fit through a brass ring at 20oC. The diameter of the ball is 2.001 cm, At what temperature does the ball just fit through the ring |

What is the ocf for this project : The project is estimated to generate $2,650,000 in annual sales, with costs of $840,000. If the tax rate is 35%, what is the OCF for this project? |

What will be the mass of the rod at the end of 20 mins : 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. |

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What is the project average accounting return : If the plant has projected net income of $1,735,000, $2,105,000, $1,954,000, and $1,286,000 over these four years, what is the project's average accounting return (AAR)? |

Determine the area of this loop : A rectangular loop of wire carrying a 4.0-A current is placed in a magnetic field of 0.60 T. What is the area of this loop |

Find the magnetic field strength inside the coil : A 380 turn solenoid of length 38.0 cm and radius 2.80 cm carries a current of 4.90 A. find the magnetic field strength inside the coil |

## Tighten the packing on a leaking argon valveA worker needs to enter a confined space to tighten the packing on a leaking argon valve. Describe two procedures that could be used to isolate the argon line and valve prior to starting work. |

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## Determine mass flowrate through boiler needed to produceDetermine the mass flowrate through boiler needed to produce 5000KW of power. |

## Emergency operations center-exercise takes place in a classWhat type of exercise takes place in a classroom setting arranged to look like an emergency operations center or in an actual emergency operations center, and involves simulation using written, telephone, and radio messaging. |

## Obtain the dimensionless groups that charactrize the problemThe power loss, p , in a journal bearing depends on length, L; diameter, D; clearance, c; and rotational speed, w. You also have to worry about lubricant viscosity, density, and pressure. Obtain the dimensionless groups that charactrize this probl.. |

## What distance must be cleared from the inside edgedesign a horizontal curve with a 40-degree central angle ( delta = 40) for a two-lane road with 11-ft lanes. The design speed is 70 mi/h and superelevation is limited to 0.06 ft/ft. Give the radius, degree of curvature, and length of curve that yo.. |

## Determine the final volume of the gas in meter cubeA piston-cylinder assembly containing 1/4 kg of a gas undergoes a constant pressure process at 5 bar beginning with a specific volume of 20 m^3/kg. for the gas in the system the work is -15 kj. determine the final volume of the gas in m^3 |

## Determine the weight of bar for distance between two baseThe bar is 1m long and its weight, W, acts at its midpoint. The angle is a=30 degrees, and the the spring constant k= 100N/m. The spring in its current position is 1.52m long, and its unstretched length of 1.25 m occurs when the bar is vertical a=.. |

## What is station and elevation of the lowest point on curveAn equal tangent vertical curve conects an initial grade of -3% and a final grade of +1% and is designed for 60mi/h. The PVI is at station 250+50 and elevation 732 ft. What is the station and elevation of the lowest point on the curve |

## Design a column base plateDesign a column base plate for a W10 x 33 column supporting a service dead load of 20 kips and a service live load of 50 kips. The column is supported by a 12-inch x 12-inch concrete pier. Use A36 steel and f 'c = 3 ksi. Answer 12 x 12 x 5/8 |

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