Hi, I kind of forgot how to solve for molarity, and I came across this question, but I checked the solutions, and, it didn't make sense. Could you help me with this question? Thank you!

Aditi Molarity is a way of expressing how much solute is present in the given solution. Basically is is the way we express concentration of solute in solution.
By definition
Molarity = moles/ volume in L = mmol /volume in mmol
If you remember we did questions based on it in unit 4.

ohh! thank you, i forgot , i will go back and revise that unit.