Ethanethiol (CH3CH2-SH) is a toxic substance and has such a strong odor that a person
can detect 0.016 mol dispersed in 5.0×1010 grams of air.
Knowing that the density of air is 1.25 g/L and assuming uniform distribution of ethanethiol in the air, the quantity
limit, in mol/L, that a person can detect is: