Question

Сколько граммов воды нужно разбавить с 300 г соли для получения раствора с концентрацией 25% соли?

Answer 1

300 грамм - 25%;
x грамм - 100%;
1) 25x = 300 * 100;
    25x = 30000;
    x = 1200 (грамм);
Ответ: 1200 грамм.

Answer 2

Calculating the Amount of Water Needed to Dilute 300g of Salt

To calculate the amount of water needed to dilute 300g of salt to obtain a solution with a concentration of 25% salt, we can use the formula for calculating the concentration of a solution:

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

In this case, the mass of the solute (salt) is 300g, and the concentration is 25%. We need to find the total mass of the solution and then determine the amount of water needed.

Calculation Steps

1. Calculate the Total Mass of the Solution: - Using the formula, we can rearrange it to find the total mass of the solution: Total mass of solution = (Mass of solute / Concentration) * 100% Total mass of solution = (300g / 25%) * 100% Total mass of solution = 1200g

2. Calculate the Amount of Water Needed: - The amount of water needed can be found by subtracting the mass of the solute from the total mass of the solution: Amount of water = Total mass of solution - Mass of solute Amount of water = 1200g - 300g Amount of water = 900g

Therefore, 900 grams of water are needed to dilute 300 grams of salt to obtain a solution with a concentration of 25% salt.

Cited Sources

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