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A 2L full bottle of benzene is left open (with a known density of 0.9 g/mL) in a small room (50m^3) and left over night. When a grad student comes in to open the lab she smells a powerful oder and notices that the bottle of benzene is now empty.
a) With no ventilation at a constant temp of 20 degrees celcius calculate teh mole fraction of benzene in the air of the room to which she was exposed.
b) Now assume that the room is ventilated at a rate of 5 m^3hr^-1. Draw a diagram of the room with all of the important parameters noted with symboles. Write a material balance to describe the rate of change in the amount of benzene in the air of the room starting from the time the bottle was opened onwards. You do not need to solve this equation. What additional data would be needed to solve it?
The potentiometric surface elevations at two observation wells 1000 m apart are 52.35 m and 56.90 m. If the horizontal hydraulic conductivity of the auquifer is 25 m/ day determine the specfic discharge, and average linear veolicity of the flow as..
Determine the maximum allowable misclose for this engineering survey using the formula based on the munber of instriunent stations used in the work.
The relative density of a sloped sand deposit is known to be 75%. Water is observed to be seeped through this slope at a rate such that the discharge velocity is 0.6 m/day. If the hydraulic conductivity for this deposit is 4×10-4 m/s.
A space is at a temperature of 75 F, and the relative humidity is 45 percent. find the partial pressures of the air and water vapor
1. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN. 2.If you want to disable STP on a port connected to a server, which command would you use
A wastewater sample was diluted by turbidity free water; 5ml was diluted to 250 ml. Turbidity of the diluted sample was 2.3 NTU, what is the turbidity of the original sample
Calculate the compacted cubic yards per hour if a compactor with a 5-ft drum width travels at 3 mph over a 10-in. lift of aggregate base course with 4 passes required to meet density specifications under average operating conditions.
Determine the horizontal and vertical components of reaction at the supports. Neglect the thickness of the beam
A rectangular steel bar shown is fixed at the right end has a thickness of 20 mm. The temperature is increased by 20C and a force F is applied as shown midway along the bar. Use the properties E=200 GPa, a=12(10^-6)/C.
They each completely penetrate a homogeneous, confined aquifer, and pump at exactly the same rate, 5m^3/day. Prior to pumping, the piezometric head was 30m, the same as the thickness of the aquifer.
the pressure drop over 15 m of 2-cm diameter galvanized iron pipe is measured to be 60 Pa. If the pipe is horizontal, estimate the flow rate of water. use for water v=10^-6 m^2/s and density of water = 1000kg/m^3
Using Rate of Return Analysis, determine the most economical alternative below. Assume a minimum attractive rate of return of 6%, and a 5-year life with no salvage value for each. The alternatives are mutually exclusive
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