Question

❥︎Question༄
​ It is desried to prepare 500 g of solution. with 10% urea in water. How much urea should we dissolve in how much volume of water?
(density of water is 1 ml)

​

Answer 1

Mass by mass percentage of urea in water = 10%

Volume of solution = 500g

Mass by mass percent =

$mass \: of \: solution \: \div \: mass \: of \: solute \: \times 100$

10=massofsolute/ 500×100

Mass of solute = 10×500/ 100=50g

Mass of solvent (water) = mass of solution - mass of solute

Mass of solvent = (500−50)g=450g

Volume of solvent (water) =mass/ density

Volume of solvent (water) =450/ 1g/mL