The concentration (w/w%) of a 200g solution of common salt is 10% if 2

1.	The concentration (w/w%) of a 200g solution of common salt is 10% if 20g more water is mixed in it then its concentration becomes1. 10.10%2.11.11%3.9.99%4.9.09%please answer fast
Answer» Given, The concentration (w/w%) of COMMON salt = 10% Mass of the solution = 200 grams To FIND, The concentration if 20 grams of water is added to the solution. Solution, Let,the mass of the solute or the common salt = x grams [Assume, x as a VARIABLE to do the further mathematical CALCULATIONS.] Now,we have to apply the w/w% concentration formula, Concentration (w/w%) = 100 × Mass of solute/Mass of solution 10 = 100 × x/200 x/2 = 10 x = 20 Mass of solute = 20 Now, mass of the solution after water ADDITION = 200+20 = 220 grams So,final concentration (w/w%) = 100 × 20/220 = 9.09% Hence, the final concentration (w/w%) will be 9.09% or Option 3.

The concentration (w/w%) of a 200g solution of common salt is 10% if 20g more water is mixed in it then its concentration becomes1. 10.10%2.11.11%3.9.99%4.9.09%please answer fast

Answer»

Given,

The concentration (w/w%) of COMMON salt = 10%

Mass of the solution = 200 grams

To FIND,

The concentration if 20 grams of water is added to the solution.

Solution,

Let,the mass of the solute or the common salt = x grams

[Assume, x as a VARIABLE to do the further mathematical CALCULATIONS.]

Now,we have to apply the w/w% concentration formula,

Concentration (w/w%) = 100 × Mass of solute/Mass of solution

10 = 100 × x/200

x/2 = 10

x = 20

Mass of solute = 20

Now, mass of the solution after water ADDITION = 200+20 = 220 grams

So,final concentration (w/w%) = 100 × 20/220 = 9.09%

Hence, the final concentration (w/w%) will be 9.09% or Option 3.