A 2-pint historical-staining tray containing (C_8H_10) is accidentally left open

Question

A 2-pint historical-staining tray containing (C_8H_10) is accidentally left open and 15% evaporates into the lab overnight. Given a lab size of 15 ft times 20 ft times 10 ft, what is the air concentration of xylene in ppm? (Density of xylene is 0.88 g/mL) a. 2003 of ppm b. 170 ppm c) 407 ppm d) 345 ppm What is the TLV in mg/m^3 of a solution containing 45% Propyl benzene (TLV 245 mg/m^3); 20 Methanol (TLV 260 mg/m^3) and 35% Vinyl chloride (TLV 10 mg.m^3)? Show work a. 9.07 mg/m^3 b. 26.6 mg/m^3 c 213.2 mg/m^3 d 34.7 mg/m^3 Which of the following is NOT a parameter affecting atmosphere dispersion a. Ultraviolet radiation b. Wind speed c Ground conditions d. Atmospheric stability In atmospheric inversion at night, which of the following is true a. Temperature decreases with height resulting in maximum vertical motion b. Temperature decreases with height resulting in minimal vertical motion c Temperature increases with height resulting in minimal vertical motion d Temperature increases with height resulting in maximum vertical motion Given the Flammability Diagram, what does point B represent? a. UOL b. LOL c UFL d. LFL

Explanation / Answer

14. Ultraviolet radiation is a parameter not affecting atmospheric dispersion.

Atmospheric stability is determined by wind speed and heating effects ( heating due to convection currents). In turn, atmospheric stability affects the way pollution is dispersed from the ground sources.

15. Temperature inversion means a deviation in the normal way how temperature changes with height. In a normal way, temperature usually decreases with height (example in hill stations). However, at night the earth cools down and the air near to the surface of earth cools down faster than air farther away from the surface. This results in a temperature inversion and the air temperature increases with height resulting in maximum vertical motion.

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