% w/w = (mass solute/mass solution). You don't have the mass of the solution nor do you have a way of determining it.
For molarity.
mols solute = grams solut/molar mass solute.
Then M = mols/L solution = mols solute/0.1 L = ?
You make a solution using a solute (5g) in water (total volume 100ml). The molar mass of the solute is 110 g/mol.
What is the molarity?
What is the concentration reported as % by mass?
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