The key to this whole space exploration stuff is not propulsion by chemical reaction. It's "propulsion" by electromagnetism.
Ya'all do know that John Galt figured this all out long time ago?
5.56mm
SPECTRE, Osato Industries, and the Red Chinese collaborated and figured landing in a dormant volcano instead of that ocean thingy.
https://www.youtube.com/watch?v=Dnaorqo6krg