Question

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?

Answer 1

Why.........`85*g` of water.........

Explanation:

`%"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, `"weight"/"volume"`, but given the context here it is `w/wxx100%`.......