Question

Hydrogen peroxide (`H_2O_2`), is sold commercially as a 3.0% (mass/volume) aqueous solution. If you buy a 500 ml bottle of hydrogen peroxide, how many grams of `H_2O_2` are dissolved in the bottle?

Answer 1

`3%` mass/volume means that there are `3` `g` of solute in every `100` `mL` of solution. That means there will be `3xx500/100` or `15` `g` of `H_2O_2` in a `500` `mL` bottle.