[Grammar] about the predicate verb of "some of the money"

[DreamFounder]

there is a question(filling the black with "be"):
- Some of the coins in my box are missing.
- Why,some of the money in my desk _ missing, too.

 

[5jj]

Some (part) of the money is missing.

We can count money, of course, but the noun 'money' is a non-count (uncountable) noun in normal usage.

The coins/notes are on the table. Some of them are missing.
The money is on the table. Some of it is missing.