From the list of compounds below identify each of their molecules:

1. Propanone C3H60 Mr=58

2. Chromium trioxide Cr2O3 Mr= 152

3.Rubidium Carbonate Rb2CO3 Mr=231

4.Neon Ne: Mr= 20.2

5. Nitrophenol C6H5NO3 Mr= 139

6. Dinitrogentetraoxide N2O4 Mr=92

Please help I am really confused, please give clear and detailled step by step answers explaining whatever you do.