Question

8. Сколько литров воды нужно разбавіть с 300 г солі для получения раствора с концентрацией 15%?

Answer 1

Обозначим количество соли в х воды 15% раствора, то есть 15% от х, в итоге получаем 0,15 х получаем равенство 300=0,15х х = 300 : 0,15=2000 л или 2 литра Ответ 2 литра воды.

Answer 2

Calculating Water Needed to Dilute Salt Solution

To calculate the amount of water needed to dilute 300 g of salt to obtain a solution with a concentration of 15%, we can use the formula for calculating the concentration of a solution:

Concentration = (Mass of solute / Total mass of solution) * 100%

Given: - Mass of solute (salt) = 300 g - Desired concentration = 15%

We can rearrange the formula to solve for the total mass of the solution:

Total mass of solution = Mass of solute / (Desired concentration / 100%)

Substitute the given values into the formula:

Total mass of solution = 300 g / (15 / 100) = 300 g / 0.15 = 2000 g

This gives us the total mass of the solution. To find the amount of water needed, we subtract the mass of the solute from the total mass of the solution:

Mass of water = Total mass of solution - Mass of solute = 2000 g - 300 g = 1700 g

So, 1700 grams of water are needed to dilute 300 grams of salt to obtain a solution with a concentration of 15%.

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