Question

до 250 г розчину солі з масовою часткою розчиненої речовини 15% додали 20 г солі.яка масова частка солі утвореному розчині?

Answer 1

Дано:

m(розч)-250г

w-15%

m(солі)-20г

Знайти:

w2-?

Розв'язок:

1)250×15/100=37,5г

2)37,5+20=57,5г

3)57,5/250×100%=23%

Відповідь:23%

Answer 2

Calculating the Mass Fraction of Salt in the Solution

To calculate the mass fraction of salt in the resulting solution, we can use the formula:

Mass Fraction = (Mass of solute / Total mass of solution) x 100%

Given: - Initial mass fraction of salt in the solution = 15% - Mass of solute added = 20g

Using the given information, we can calculate the mass fraction of salt in the resulting solution.

Calculation

The initial mass of the solution can be represented as: - Mass of salt = 15% of total mass of solution - Mass of solvent (water) = 100% - 15% = 85% of total mass of solution

When 20g of salt is added to the solution, the total mass of salt becomes: - Total mass of salt = Initial mass of salt + Mass of solute added - Total mass of salt = (15% of total mass of solution) + 20g

Now, we can calculate the mass fraction of salt in the resulting solution using the formula mentioned earlier.

Result

The mass fraction of salt in the resulting solution can be calculated as: - Mass Fraction = (Total mass of salt / Total mass of solution) x 100%

This calculation will provide the mass fraction of salt in the resulting solution.