Question

Смешали 8 литров 10-процентного водного раствора некоторого вещества с 12 литрами 35-процентного водного раствора этого же вещества. Сколько процентов составляет концентрация получившегося раствора?

Answer 1

В 8-ми литрах раствора 10% спирта, то-есть 0.8 литра.
а в 12-ти литрах растворах 35% спирта, то-есть 4.2 литра.
после смешивания получился раствор в 20 литров, из которых 5 литров составляет спирт. 5 литров из 20-ти составляет 0,25, то-есть 25%.
Ответ: 25%.

Answer 2

Calculation of Concentration of the Solution

To calculate the concentration of the resulting solution, we need to determine the amount of the substance in the solution and express it as a percentage.

Let's assume that the substance in question is X.

The given information states that 8 liters of a 10% aqueous solution of substance X are mixed with 12 liters of a 35% aqueous solution of substance X.

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

Concentration of resulting solution = (Total amount of substance X / Total volume of solution) * 100

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

1. Calculate the total amount of substance X: - For the 10% solution: 10% of 8 liters = 0.1 * 8 liters = 0.8 liters of substance X - For the 35% solution: 35% of 12 liters = 0.35 * 12 liters = 4.2 liters of substance X

2. Calculate the total volume of the resulting solution: - 8 liters + 12 liters = 20 liters

3. Calculate the concentration of the resulting solution: - (Total amount of substance X / Total volume of solution) * 100 - (0.8 liters + 4.2 liters) / 20 liters * 100 = 5 liters / 20 liters * 100 = 25%

Therefore, the concentration of the resulting solution is 25%.