1. The problem statement, all variables and given/known data Ethanethiol (CH3CH2SH) can be smelled in as little as 0.36 parts per billion. 1 ppb = 1x10^-9 g/mL. What is the pressure of the gas in mmHg at this concentration? 2. Relevant equations None 3. The attempt at a solution Well, I took .36 of 1x10^-9 g/mL. Not quite sure what to do next. I know the density could also be expressed as (Pressure)(Molar mass)/(Gas constant)(Temp), but I'm not given a temperature. A nudge in the right direction would be greatly appreciated!