Question

К 200 г 20% раствора натрий хлорида долили 50 мл води. Вычислите массовую долю соли в полученом растворе

Answer 1

50мл=50 г
ω=((0.2*200)/(200+50))*100%=16%

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 following formula:

Mass Fraction = (mass of salt / total mass of solution) * 100%

Given: - Initial solution: 200 g of 20% sodium chloride solution - Added: 50 ml of water

First, we need to find the mass of salt in the initial solution and the total mass of the resulting solution.

The mass of salt in the initial solution can be calculated as: Mass of salt = 200 g * (20/100) = 40 g.

The total mass of the resulting solution can be calculated as: Total mass = Mass of initial solution + Mass of water = 200 g + 50 g = 250 g.

Now, we can calculate the mass fraction of salt in the resulting solution: Mass Fraction = (40 g / 250 g) * 100% = 16%.

Therefore, the mass fraction of salt in the resulting solution is 16%.