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The dimension of a room is 10 feet high, 40 feet long and 30 feet wide. If ¼ point of pyridine is allowed to volatilize in this room at NTP with nor ventilation, what is the concentration in mg/m3 and ppm for pyridine in this room? Pyridine s.g. = 0.98

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Answer:

Concentration in mg/m^3 = 3845.39mg/m^3

in PPM =  3.84539 ppm

Explanation:

From the dimensions, we compute the volume (V)

V = 10 x 40 x 30 = 12000ft^3

Volatilize volume = 1/4 *12000 = 3000ft^3 at NTP

Volume of pyridine in the room = ( 12000 - 3000) = 9000ft^3

converting to meters = 9000 * (0.3048)^3m^3

= 254. 85m^3

Computing concentration(C) =  mass/s.g/volume

S.g converted to mg per meter cube = 0.98x1000= 0.98 * 10^3g/m^3 = 0.98 * 10^6mg/m^3

Hence concentration =  0.98 * 10^6/254.85 = 3845.39 mg/m^3

Parts per million denotes low concentration of a solution

1ppm = 1mg per liter , and 1 liter = 0.001m^3

Hence, this  =  3845.39/1000 = 3.84539 PPM

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