13 Jun The Occupational Safety and Health Administration
Question
The Occupational Safety and Health Administration has set the limit on the maximum percentage of carbon dioxide (CO2) in air a worker can breathe at 0.500% by mole. If dry ice (solid CO2) is sublimating in a room at a rate of 0.610 mol/min, what is the minimum rate that fresh air (mol air/min) has to be supplied to the room so that the concentration of CO2 in the room doesn’t exceed 0.500% by mole? Assume the room is well mixed, and the volume of the solid dry ice does not change.
What is the percent by mass of oxygen in a gaseous mixture whose molar composition is 0.500% CO2 and 99.500% air? The composition of air is 21% mole O2, 70% mole N2 and has an average molar mass of 29.0 g/mol.
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