Answer:
[tex]NH_3+H_2O\operatorname{\rightarrow}NH_4OH.[/tex]Explanation:
The reaction between ammonia (NH3) and water (H2O) would be a combination reaction: a combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is:
[tex]A+B\rightarrow AB.[/tex]In our case, the product would be ammonium hydroxide (NH4OH):
[tex]NH_3+H_2O\rightarrow NH_4OH.[/tex]