Given :
Mass of substance = 2g,
mass of water = 18g
To find :
Mass % of solute
Formula :
Mass percent = \(\frac{Mass\,of\,Solute}{Mass\,of\,Solution}\) x 100
Calculation :
Mass percent of A = \(\frac{Mass\,of\,A}{Mass\,of\,solution}\) x 100
= \(\frac{2g}{2g\,of\,A+18g\,of\,water}\) x 100
= \(\frac{2g}{20g}\) x 100
= 10% w/w
Mass percent of A = 10% w/w
