Question

УМОЛЯЮ ПОМОГИТЕ С ХИМИЕЙ СРОЧНО НУЖНО РЕШИТЬ ЗАДАЧУ, С ДАНО! приготовить 15 г раствора с массовой долей растворенного вещества 8%.​

Answer 1

массовая доля = масса растворенного вещества / масса раствора

0.08 * 15 = 0.6

масса растворенного вещества = 0.6

Answer 2

Preparation of a 15g Solution with an 8% Mass Fraction of Solute

To prepare a 15g solution with a mass fraction of 8% of the dissolved substance, we need to determine the amount of solute and solvent required.

Let's break down the steps to solve this problem:

1. Calculate the mass of the solute: - The mass fraction is given as 8%, which means that 8% of the total mass of the solution is the solute. - To find the mass of the solute, multiply the total mass of the solution (15g) by the mass fraction (8% or 0.08): ``` Mass of solute = Total mass of solution * Mass fraction = 15g * 0.08 = 1.2g ``` - Therefore, the mass of the solute required is 1.2g.

2. Calculate the mass of the solvent: - The mass of the solvent can be found by subtracting the mass of the solute from the total mass of the solution: ``` Mass of solvent = Total mass of solution - Mass of solute = 15g - 1.2g = 13.8g ``` - Therefore, the mass of the solvent required is 13.8g.

3. Verify the calculations: - To confirm the accuracy of the calculations, we can check if the mass of the solute and solvent add up to the total mass of the solution: ``` Mass of solute + Mass of solvent = Total mass of solution 1.2g + 13.8g = 15g 15g = 15g ``` - The calculations are correct since the equation is balanced.

Therefore, to prepare a 15g solution with a mass fraction of 8% of the dissolved substance, you will need 1.2g of the solute and 13.8g of the solvent.

I hope this helps! Let me know if you have any further questions.