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I learned some time ago that the Soyuz capsules use hydrogen peroxide as a monopropellant. I'm trying to use this fact for a chemistry question posed to my students, but I cannot find anywhere how much the descent module holds, just that it uses hydrogen peroxide.
What's the propellant mass for the Soyuz descent capsule or what's its tank capacity?
The Soyuz Crew Operations Manual says the system holds between 29.6 and 31.4 kg of peroxide.
It also has a nice schematic of the system.
