Question

How many g of a solute are in 2 kg of 10% (w/w) solution?

Answer 1

Percentage by mass ( % w/w ) is the measure of concentration of a substance/solute in a solution. It is the ratio of mass of solute to the total mass of the solution multiplied by 100 .

Percentage by mass of solute (% w/w) = ( Mass of solute / Mass of solution ) * 100

Given,

Percentage by mass (% w/w) = 10

Mass of solution = 2 Kg = 2000 g

On substituting given values in above formula we get,

Mass of solute = ( 10 * 2000 ) / 100 = 200 g

Mass of solute in solution = 200 g