Tobacco smoke is often considered the most harmful and widespread contaminant of indoor air. Scientists have identified over 4,000 different chemical compounds in tobacco smoke of which at least 50 are known carcinogens. Long term exposure to tobacco smoke has been linked to heart disease, cancer, and respiratory illness in young children and retardation of growth and development of fetuses during pregnancy. Consider an enclosed space with a volume of 12 m 12 m 4 m that has 30 persons smoking two cigarettes every hour. One of the gases coming out of a cigarette is formaldehyde and each cigarette may be assumed to emit 1.35 mg of formaldehyde. Conversion of formaldehyde to carbon dioxide can be assumed to be first order and the rate of reaction is 0.40 per hour. Outside/fresh air enters the enclosed space at the rate of 800 m³ per hour. Assume the smoke becomes completely mixed with air and this smoke-mixed air leaves the enclosed space at the same rate that the fresh air enters. a. What is the concentration of formaldehyde in the room air at steady state? b. If the threshold for eye irritation due to formaldehyde is 0.05 ppm (parts per million), what is the minimum flow rate of fresh air that needs to be maintained for the enclosed space? a. At the assumed temperature of 25 °C and pressure of 1 atm for the enclosed space, convert to ppm using the formula ppm = mg/m³ 24.45/M, where M is 30, the molecular weight of formaldehyde.
Tobacco smoke is often considered the most harmful and widespread contaminant of indoor air. Scientists have identified over 4,000 different chemical compounds in tobacco smoke of which at least 50 are known carcinogens. Long term exposure to tobacco smoke has been linked to heart disease, cancer, and respiratory illness in young children and retardation of growth and development of fetuses during pregnancy. Consider an enclosed space with a volume of 12 m 12 m 4 m that has 30 persons smoking two cigarettes every hour. One of the gases coming out of a cigarette is formaldehyde and each cigarette may be assumed to emit 1.35 mg of formaldehyde. Conversion of formaldehyde to carbon dioxide can be assumed to be first order and the rate of reaction is 0.40 per hour. Outside/fresh air enters the enclosed space at the rate of 800 m³ per hour. Assume the smoke becomes completely mixed with air and this smoke-mixed air leaves the enclosed space at the same rate that the fresh air enters. a. What is the concentration of formaldehyde in the room air at steady state? b. If the threshold for eye irritation due to formaldehyde is 0.05 ppm (parts per million), what is the minimum flow rate of fresh air that needs to be maintained for the enclosed space? a. At the assumed temperature of 25 °C and pressure of 1 atm for the enclosed space, convert to ppm using the formula ppm = mg/m³ 24.45/M, where M is 30, the molecular weight of formaldehyde.
Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter10: Entropy And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 10.17PAE
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Transcribed Image Text:Tobacco smoke is often considered the most harmful and widespread contaminant of indoor air. Scientists have identified over 4,000 different chemical compounds in
tobacco smoke of which at least 50 are known carcinogens. Long term exposure to tobacco smoke has been linked to heart disease, cancer, and respiratory illness in young
children and retardation of growth and development of fetuses during pregnancy.
Consider an enclosed space with a volume of 12 m 12 m 4 m that has 30 persons smoking two cigarettes every hour. One of the gases coming out of a cigarette is
formaldehyde and each cigarette may be assumed to emit 1.35 mg of formaldehyde. Conversion of formaldehyde to carbon dioxide can be assumed to be first order and the
rate of reaction is 0.40 per hour. Outside/fresh air enters the enclosed space at the rate of 800 m³ per hour. Assume the smoke becomes completely mixed with air and this
smoke-mixed air leaves the enclosed space at the same rate that the fresh air enters.
a. What is the concentration of formaldehyde in the room air at steady state?
b. If the threshold for eye irritation due to formaldehyde is 0.05 ppm (parts per million), what is the minimum flow rate of fresh air that needs to be maintained for the
enclosed space?
a. At the assumed temperature of 25 °C and pressure of 1 atm for the enclosed space, convert to ppm using the formula ppm = mg/m³ 24.45 / M, where M is 30, the
molecular weight of formaldehyde.
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