Question

4. Провели випарювання 1,2 кг розчину з масовою часткою солі 20%. Маса розчину після випарювання дорівнює 1 кг. Якою стала масова частка солі в новоутвореному розчині?

Answer 1

1,2*0,2=0,24 кг соли
0,24/1*100%=24%

Answer 2

Calculation of the Mass Fraction of Salt in the Solution

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

Mass fraction of salt = (Mass of salt / Mass of solution) * 100%

Given that the initial mass of the solution is 1.2 kg and the mass fraction of salt is 20%, we can calculate the mass of salt in the solution:

Mass of salt = Mass fraction of salt * Mass of solution / 100%

Substituting the given values:

Mass of salt = 20% * 1.2 kg / 100%

Calculating the mass of salt:

Mass of salt = 0.2 * 1.2 kg = 0.24 kg

After evaporation, the mass of the solution becomes 1 kg. To find the mass fraction of salt in the new solution, we can use the same formula:

Mass fraction of salt = (Mass of salt / Mass of solution) * 100%

Substituting the values:

Mass fraction of salt = (0.24 kg / 1 kg) * 100%

Calculating the mass fraction of salt in the new solution:

Mass fraction of salt = 24%

Therefore, the mass fraction of salt in the newly formed solution is 24%.

Please note that the search results provided by You.com did not contain relevant information for this specific calculation. The calculation was done based on the given information and the formula for calculating mass fraction.