Al(NO3)3 + NH3 --> ?

Answer 1

No reaction.

However, if the ammonia is dissolve in water, and the aluminum nitrate is dissolved, this reaction is likely.

Al(NO3)3 (aq) + 3NH4OH (aq) (aqueous NH3) -----> Al(OH)3 (s) + 3NH4NO3 (aq)