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A pub opens its door for business at 6:00 PM. From 6:00 P.M. to 8:00 P.M....

A pub opens its door for business at 6:00 PM. From 6:00 P.M. to 8:00 P.M. 50 smokers in the pub smoke 2 cigarettes per hour and each cigarette emits 4mg formaldehyde. Fresh air is introduced into the pub @ 1,000 m3/hr. At 8:00 P.M. the number of smokers in the pub increases from 50 to 75 and as a result, the fresh air flow rate is increased from 1,000 m3/hr to 1,500 m3/hr to flush out the stale air. Assume that all smokers in the pub still smoke 2 cigarettes per hour, what is the formaldehyde concentration (ppmv) in the air inside the pub @ 9:00 P.M.?

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Amanda K answered 5 months ago
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