I am trying to create bass lines using the tone generator in audacity, for rap/trap instrumentals like in this song: https://www.youtube.com/watch?v=PVKYblaivTc . I need help determining what frequency is what musical note. For example, I know that 440hz is A, which translates to 55hz, (440/2=220/2=110/2=55), which is the appropriate frequency for said instrumentals. I need to know what the frequencies are for the rest of the tones on the chromatic scale; C, D, E, F, G, and B. any help would be appreciated 
There is a plug-in available here that you may find useful: https://forum.audacityteam.org/t/convert-note-to-frequency-and-frequency-to-note/33911/1