Uh for the long march 3b boosters udmh / n2o2 is the primary propellant. That entire booster was full of it, so yes, it's liable to be a tonne or so left over

Uh for the long march 3b boosters udmh / n2o2 is the primary propellant. That entire booster was full of it, so yes, it's liable to be a tonne or so left over (full propellant mass in the stage is double digit tonnes) https://en.m.wikipedia.org/wiki/Long_March_3B https://en.m.wikipedia.org/wiki/Long_March_3B