From Krzysztof Mitko@21:1/5 to All on Fri Jul 3 07:57:51 2020
I don’t think ammonium hydroxyfluoride exists in the first place :). Do
you mean hydrofluoride – NH4HF2? I doubt it can work as fuel. It’s non-flammable, and although it can decompose to gases at high
temperature (expanding gas can power something), the costs would
probably be enormous and the products are extremely corrosive and toxic.