Question

What are common mistakes students make with molarity?

Answer 1

Molarity symbol is a uppercase m; M. (mol/L)
This can be often mistaken for the mass symbol, m (g), or the symbol for molar mass, which also M (g/mol).
The symbols are the same, the units aren't. This is why reading the question carefully is important.

Explanation:

Students also often rush through the question and not read it properly. If it says molarity or concentration, the units you are given are mol/L, not g/mol, or L/mol, etc.

They must not mistake the values that are given in the question, or they will make errors using dimensional analysis/unit analysis or using formulas.