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The chemical 1,4-dichlorobenzene (1,4-DCB) is sometimes used as a disinfectant in public lavatories. At 20°C (68°F) the vapor pressure is 5.3 × 10-4 atm. (a) What would be the maximum concentration in the air in units of g/m3? The molecular weight of l,4- DCB is 147 g/mole. (b) An alternative disinfectant is 1-bromo-4-chlorobenzene (l,4-CB). The boiling point of l,4-CB is 196°C, whereas the boiling point of l,4-DCB is 180°C. Which compound would cause the highest concentrations in the air in lavatories?
At what point on the expressway should the motorist step on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp
an observer has determined that the time headways between successive vechile on a section of the highway are exponentially distributed and that 65% of the headways btw vehicles are 9 seconds or greater.
ABC is a triangular tract of land. The 1.5 tract DEFG is to be subdivided. AE is 480ft and DC is 350 ft. Determine the lengths of DG and CB. (Note 1 acre= 43,560 f^2)
The rivets are 10 mm in diameter, spaced a distance s = 24.4 mm apart, and have an average shear strength of 35 MPa. Determine the maximum internal pressure in MPa if the rivets are not to shear.
how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear- wheel-drive options is equal (assume that all other variables are unchanged)
Using a design speed of 50 mi/h, determine the stations and elevations of PVCs, PVIs, and PVTs of the two vertical curves required to connect the highway segments, as well as the length of the constant grade section (connecting grade is to be as s..
A 15kg Block rests on top of a 25kg Block which is subject to a 400N force. Block B sits on a table. the Coeffiecents of friction are the same for all surfaces, u(s) is .4 and U(k) is .3. The force is Applied to the bottom block ( with no inclinat..
A compressible 12-ft clay layer beneath a building is overlain by a stratum of sand and gravel and underlain by impermeable bedrock. The total expected primary consolidation settlement of the compressible clay layer due to the building load is 4.6..
The plant currently has one CMFR for removal of chromium. How many more identical reactors does the sony music company require to meet the regulatory requirements for chromium discharge of 0.01 mg/L into the Pitman Sewer?
The vehicle was estimated to hit the light pole at 30 mph. The skid was 650 feet long. How fast was the car traveling before applying the brakes
An underground gasoline storage tank has leaked benzene into an unconfined aquifer over a period of several months. The aquifer characteristics are: Ambient temperature=8 oC Hydraulic conductivity = 123 ft/day Hydraulic gradient = 0.00091 ft/ft
if the enginer is mounted floatiing on very weak spring, what is the amplitude of the vertical vibration of the engine? (b) if the engine is mounted solidly on a rigid foundation, what is the alternating force amplitude transmitted? Assume the con..
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