Question

К 200 граммам раствора , с массовой долей хлорида натрия 24% долили 20 грамм воды .Определите долю в полученном растворе???

Answer 1

Дано:m (NaCl) =200 гw% (NaCl) = 24%m (H2O) = 20 гРешение:m (NaCl) = 200*0.24 = 48 (г)m (нового раствора) = 200+20 = 220 (г)w% (NaCl) = (48*100)/220 = 21.8%

Answer 2

Calculation of the Mass Fraction of Sodium Chloride in the Solution

To determine the mass fraction of sodium chloride in the solution, we need to consider the initial mass of the solution and the mass of water added.

Given: - Initial mass of the solution: 200 grams - Mass fraction of sodium chloride: 24% - Mass of water added: 20 grams

To calculate the mass fraction of sodium chloride in the resulting solution, we can use the following formula:

Mass Fraction of Sodium Chloride = (Mass of Sodium Chloride / Total Mass of Solution) * 100

Let's calculate it step by step:

1. Calculate the mass of sodium chloride in the initial solution: - Mass of sodium chloride = Mass fraction of sodium chloride * Total mass of solution - Mass of sodium chloride = 24% * 200 grams - Mass of sodium chloride = 0.24 * 200 grams - Mass of sodium chloride = 48 grams

2. Calculate the total mass of the resulting solution: - Total mass of the resulting solution = Initial mass of the solution + Mass of water added - Total mass of the resulting solution = 200 grams + 20 grams - Total mass of the resulting solution = 220 grams

3. Calculate the mass fraction of sodium chloride in the resulting solution: - Mass fraction of sodium chloride = (Mass of sodium chloride / Total mass of the resulting solution) * 100 - Mass fraction of sodium chloride = (48 grams / 220 grams) * 100 - Mass fraction of sodium chloride ≈ 21.82%

Therefore, the mass fraction of sodium chloride in the resulting solution is approximately 21.82%.

Please note that the calculations are approximate due to rounding.