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Formaldehyde is a carcinogenic volatile organic compound with a permissible exposure level of 0.75 ppm. At this level, how many grams of formaldehyde are permissible in a 6.0-L breath of air having a density of 1.2 kg/m^3? A) 5.4 g formaldehyde B) 3.8 × 10^-2 g formaldehyde C) 5.4 × 10^-6 g formaldehyde D) 3.8 g formaldehyde