Air ain't free

H-types run at 48 ppm nitrogen (nuclei) by mass. Let us be more pessimistic; let us send our luckless COLONISERS to a shattered Hebe at an Atíra orbit, for 46.3 ppm. The mission: fill 100m×100m×10m with 46.3 tonnes of nitrogen gas.

I figure a million tonnes of the rubble to get 46.3 tonnes of the gas. And no cheating by using focused solar rays to do it: we must release the nitrogen under 15 meters of roof, sealed on the inside, so's to keep the gas from exploding into space. (Add oxygen to push the mix to 74.41 tonnes and keep the ceiling from falling, at that.)

That nitrogen will start in the form of N₂; but a colony will next want ammonium-nitrate, nitric acid, nitrous oxide and other compounds for food and profit. Hebe will, in short, make you work for it.

For Hebe proper, longterm, 6.1×10¹¹ tonnes of N₂ seem/s plenty. The question remains how Hebe's colony can get started. (Bennu's nitrogen is, I hear, good-to-go almost at the beginning; but this blog goes hard-mode.)