Question

К 200 граммам 5% раствора соли,добавили 10 г соли и 50 г воды. Найти массовую долю соли в полученном растворе.

Answer 1

5*200 + 100*10 + 0*50 =Х*260 (первые множители - концентрация, вторые - масса)
1000+1000+0=260Х
Х=7,7%

Answer 2

Calculation of Mass Fraction of Salt in the Solution

To find the mass fraction of salt in the solution, we need to calculate the total mass of the solution and the mass of the salt present.

Given: - Initial solution: 200 grams of 5% salt solution - Additional salt added: 10 grams - Additional water added: 50 grams

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

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

Let's calculate the total mass of the solution first:

Total Mass of Solution = Initial Solution Mass + Additional Salt Mass + Additional Water Mass

Total Mass of Solution = 200 grams + 10 grams + 50 grams

Total Mass of Solution = 260 grams

Now, let's calculate the mass of salt in the solution:

Mass of Salt = Initial Solution Mass * Initial Salt Concentration + Additional Salt Mass

Mass of Salt = 200 grams * 5% + 10 grams

Mass of Salt = 10 grams + 10 grams

Mass of Salt = 20 grams

Now, we can calculate the mass fraction of salt in the solution:

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

Mass Fraction of Salt = 20 grams / 260 grams

Mass Fraction of Salt ≈ 0.0769 or 7.69%

Therefore, the mass fraction of salt in the obtained solution is approximately 7.69%.