Question

К раствору 200 г с массовой долей 25% добавили 10 г соли. Найдите массовую долю в новом растворе

Answer 1

МД  - массовая доля
МД=((200*0,25+10*1)/(200+10))*100%

Answer 2

Calculation of Mass Fraction in the New Solution

To find the mass fraction in the new solution, we need to consider the initial solution and the added salt.

Given: - Initial solution mass: 200 g - Initial solution mass fraction: 25% - Salt mass added: 10 g

To calculate the mass fraction in the new solution, we can use the following formula:

Mass Fraction = (Mass of Component) / (Total Mass of Solution)

Let's calculate the mass fraction in the new solution step by step:

1. Calculate the mass of the initial solute in the initial solution: - Mass of the initial solute = Mass of the initial solution * Mass fraction of the initial solution - Mass of the initial solute = 200 g * 0.25 = 50 g

2. Calculate the total mass of the new solution: - Total mass of the new solution = Mass of the initial solution + Mass of the added salt - Total mass of the new solution = 200 g + 10 g = 210 g

3. Calculate the mass fraction in the new solution: - Mass fraction in the new solution = Mass of the initial solute + Mass of the added salt / Total mass of the new solution - Mass fraction in the new solution = (50 g + 10 g) / 210 g

Therefore, the mass fraction in the new solution is 60/210 or approximately 0.2857.

Please note that the search results provided did not directly answer the question. Therefore, the calculation was performed based on the given information and general knowledge of mass fraction calculations.