Question

СРОЧНОООО. В сосуд, содержащий 8 литров 24-процентного водного раствора некоторого вещества, добавили 4 литра воды. Сколько процентов составляет концентрация получившегося раствора?

Answer 1

Концентрация раствора равна
с=Vв-ва/Vр-ра*100%

Объем вещества в исходном растворе равен 0,28*8=1,92 литра. При добавлении 4 литров воды общий объем раствора увеличится, а объем растворенного вещества останется прежним. Таким образом, концентрация полученного раствора станет равна:
1,92/(8+4)*100%=1,92/12*100%=16

Ответ: 16.

Answer 2

Calculation of Concentration

To calculate the concentration of the resulting solution, we need to consider the initial concentration of the 24% aqueous solution and the volume of water added.

Given: - Initial volume of the solution = 8 liters - Initial concentration of the solution = 24% - Volume of water added = 4 liters

To find the concentration of the resulting solution, we can use the following formula:

Concentration = (Total amount of solute / Total volume of solution) * 100

Let's calculate the concentration of the resulting solution step by step.

1. Calculate the total amount of solute in the initial solution: - Initial volume of the solution = 8 liters - Initial concentration of the solution = 24% - Total amount of solute = (Initial volume of the solution * Initial concentration of the solution) / 100 - Total amount of solute = (8 liters * 24%) / 100

2. Calculate the total volume of the resulting solution: - Total volume of the resulting solution = Initial volume of the solution + Volume of water added - Total volume of the resulting solution = 8 liters + 4 liters

3. Calculate the concentration of the resulting solution: - Concentration of the resulting solution = (Total amount of solute / Total volume of the resulting solution) * 100

Let's calculate the values:

1. Total amount of solute: - Total amount of solute = (8 liters * 24%) / 100 = 1.92 liters

2. Total volume of the resulting solution: - Total volume of the resulting solution = 8 liters + 4 liters = 12 liters

3. Concentration of the resulting solution: - Concentration of the resulting solution = (1.92 liters / 12 liters) * 100

Therefore, the concentration of the resulting solution is approximately 16%.

Please note that the search result snippet provided does not directly answer the question. However, the calculation provided above is based on the general formula for calculating concentration and does not require additional sources.