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An unvented kerosene heater is operated for 1 hr in an apartment having a volume of...

An unvented kerosene heater is operated for 1 hr in an apartment having a volume of 200 m3.  The heater emits SO2at a rate of 50 µg/s.  The ambient air concentration (Ca) and the initial indoor air concentration (C0) of SO2 is 50 ppb (P= 1 atm, Tindoor=20°C, Toutdoor=5°C).  The ventilation rate in the apartment is 0.9 air changes per hour.  If the apartment is well-mixed, what is the indoor air concentration of SO2 in µg/m3 at the end of 1 hr if the decay rate for SO2 is 6.39 × 10−5 s−1?

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