Carbon monoxide (CO) detectors sound an alarm when peak levels of carbon monoxide reach 100 parts per million (ppm). This level roughly corresponds to a composition of air that contains 400,000 mg carbon monoxide per cubic meter of air (400,000 mg/m3). Assuming the dimensions of a room are 18 ft 3 12 ft 3 8 ft, estimate the mass of carbon monoxide in the room that would register 100 ppm on a carbon monoxide .