What's the plural form of mercurammonium? Here's the word you're looking for.
Answer
The noun mercurammonium can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be mercurammonium.
However, in more specific contexts, the plural form can also be mercurammoniums e.g. in reference to various types of mercurammoniums
or a collection of mercurammoniums.