1. The problem statement, all variables and given/known data The estimated average concentration of carbon monoxide in air in the United States in 1991 was 6.0 ppm. Calculate the number of CO molecules in 1.0 L of this air at a pressure of 601 torr and a temperature of 20.°C. 2. Relevant equations pv=nrt 3. The attempt at a solutionI tried this and using pv=nrt pressure was converted to torr volume was 1 r was taken as 8.31 temp was converted into K and then... n was solved for, and muktiplied by avagadro's number Am i missing something? am i supposed to include the ppm? i am so confused. please help.