Question: Thank you for your help! I have the answer key but I am not sure what I am doing wrong so please show your work

Thank you for your help! I have the answer key but I am not sure what I am doing wrong so please show your work and I will gladly upvote if it is correct!

1. Concentration unit: a. Covert 20 cm CO in 1 m3 of air to ppm. (5 points) b. Convert the 1-hr NAAQS standard for NO, to ug/m? (15 points) C. 0.5 g/min of liquid toluene is volatilized into the air stream at 15 feet/min through a 20- inch diameter conduit. What is the concentration of toluene in ppm? P = 1 atm and T = 25 C. (15 points)

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