1. An unvented kerosene space heater releases CO at the rate of 1.0 g/hr into a room having a volume of 50 m^{3} and an air change rate of 1/hr.

a. What is the steady-state CO concentration expected in the room?

b. How does the CO concentration change with time after the heater’s fuel supply is depleted (assume that steady state is reached before it runs out of fuel).

Hint: after the heater’s fuel supply is depleted, the CO concentration in the room will decay exponentially, with a first-order decay rate of 1/hr.

3. New carpeting is installed in a closed large room. The carpet outgases formaldehyde at a total rate of 2.3 g/hr. (Consider the room with a negligible ventilation rate). If the room has a volume of 750 m^{3}, what is the expected formaldehyde concentration expressed in ppm by volume at a temperature of 25 degrees Celsius and a pressure of 1 atmosphere after 3 hours? Formaldehyde: CH_{2}O

3.

Subject | Science |

Due By (Pacific Time) | 04/20/2014 12:00 am |

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