Question

calculate the amount of glucose required to prepare 250g of 5% solution by mass?

Answer 1

 just hav to apply the formula here :)

its given that 

 mass of solution = 250 g

concentration of solution = 5%

let mass of solute =x

we knw dat concentration % = mass of solute / mass of solution * 100

            ie,5 = x / 250 * 100

              by rearranging it we get x = 12.5g

x = mass of solute = mass of glucose = 12.5g