Question

What is the concentration by mass of `5.5*g` mass of lithium bromide dissolved in `4.5*mL` of water?

Answer 1

Is it not `55%`....?

Explanation:

Lithium bromide is very soluble stuff.... I maintain that you could take a mass of `5.5*g` of the salt, and add `4.5*mL` of water, and get a solution....that is demonstrably `55%` by mass and whose VOLUME would be little different from the starting volume of pure solvent.....you will have to specify the concentration you want.