Question

a solution contains 20 g of common salt in 180 g of water calculate the concentration in terms of mass percentage of the solution

Answer 1

mass of solute = 20g
mass of solvent = 180g
mass of solution = 180+20g = 200g
concentration= 20/200×100 =20/2=10%

Answer 2

Answer:

The concentration in terms of mass percentage ( w/w% ) is $10\%$.

Explanation:

Data given,

The common salt's mass ( solute ) = $20g$

The water's mass ( solvent ) = $180g$

The concentration in terms of mass percentage ( w/w% ) =?

As we know,

• Mass by mass percentage = $\frac{mass of solute}{mass of solution}\times 100$     -------equation (1)

Now,

• The mass of the solution = mass of solute + mass of solvent
• The mass of the solution = $20 + 180$ = $200g$

After putting the values in equation (1), we get:

• Mass by mass percentage = $\frac{20}{200}\times 100$ = $10\%$.

Hence, concentration in terms of mass percentage ( w/w% ) = $10\%$.