Deducing the unit missing from the solution to a basic quantitative problem

Question

A student sets up and solves the following equation to solve a problem in solution stoichiometry.

Fill in the missing part of the student's equation.

(1.28 g/mL)(1mL/10^-3 L) / (123.17 [ ?]) = 10.4 mol/L

Answer 1

Units of the final answer are mol/L.

Using dimensional analysis, the units of the given equation, without including the missing part are g/L. To get g/L to mol/L the missing part must be g/mol