The molecular weight I'm guessing you want:
Nitrogen = 28.0134
Oxygen = 31.9988
Carbon Dioxide = 44.01
Ammonia = 17.02
Propane = 44.097
Therefore Propane is the heaviest and Ammonia the lightest.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
