Question

К 620 г 15% раствора добавили 80 г воды.Рассчитайте массовую долю вещества в образовавшемся растворе.

Answer 1

Дано: m(р-ра)1=620 г; w1=15 %(0,15); m(H2O)=80 г; Найти: w2-?
m(в-ва)=w * m(р-ра)1=0,15 * 620=93 г; m(р-ра)2=620+80=700 г;
w2=m(в-ва) / m(р-ра)2=93 / 700=13,3 %.

Answer 2

Calculation of Mass Fraction in the Solution

To calculate the mass fraction of the substance in the resulting solution, we need to know the initial mass of the solution and the mass of the added water.

Given: - Initial mass of the solution: 620 g - Mass of water added: 80 g

To calculate the mass fraction, we can use the formula:

Mass Fraction = Mass of Substance / Total Mass of Solution

To find the mass of the substance, we need to subtract the mass of water added from the initial mass of the solution:

Mass of Substance = Initial Mass of Solution - Mass of Water Added

Let's calculate the mass of the substance and then the mass fraction.

Calculation:

Initial mass of the solution = 620 g Mass of water added = 80 g

Mass of substance = Initial mass of solution - Mass of water added Mass of substance = 620 g - 80 g Mass of substance = 540 g

Mass fraction = Mass of substance / Total mass of solution Mass fraction = 540 g / 620 g

Now, let's calculate the mass fraction.

Answer: The mass fraction of the substance in the resulting