# A 15*g mass of solute was dissolved in a mass of water to give a 15% "w/w" solution. What was the mass of water used to make the solution?

Jul 6, 2017

Why.........$85 \cdot g$ of water.........
%"solution"="Mass of solute"/"Mass of solvent and solute"xx100%
=(15*g)/(15.0*g+85.0*g)xx100%=15%w/w
Here we define w/w%......There are other definitions, $\text{weight"/"volume}$, but given the context here it is w/wxx100%.......