Final answer:
The question provided lacks a valid chemical reaction for the compounds NH4 and H-O. Without this information or clarification of the typo, it's impossible to determine the limiting reactant.
Step-by-step explanation:
To identify the limiting reactant in a chemical reaction, we need to compare the mole ratio of the reactants with the stoichiometry of the balanced chemical equation. However, as the provided question does not include the balanced chemical equation that these reactants form, it's impossible to determine the limiting reactant between NH4 and H-O (which might be a typo and could refer to H2O or another compound).
If we correct the typo and assume H-O refers to water (H2O), and NH4 to ammonium (NH4+), these species do not typically react directly with each other to form a simple product. They might participate in an acid-base reaction, but the question lacks the details necessary to proceed with the identification of a limiting reactant. If this is part of a larger equation, such as the synthesis of an ammonium salt, the stoichiometry of that equation would be necessary to determine the limiting reactant.