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A person is in a room with a back-drafting space heater that emits carbon monoxide. If this person's blood carboxyhemoglobin level is 10%, what

A person is in a room with a back-drafting space heater that emits carbon monoxide. If this person's blood carboxyhemoglobin level is 10%, what is the actual CO concentration (in ppm) in the room? (Assume that the COHb/O2Hb ratio in the body is at equilibrium at all times).

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