Question

Смешали 150 грамм 20 % раствора и 350 грамм 10 % раствора. Определить массовую долю растворенного вещ-ва в полученном растворе

Answer 1

Mсоли=150*0,2+350*0,1=65 г.
mр-ра=150+350=500 г.
wр.в-ва=65/500=0,13 (13%)

Answer 2

Calculation of Mass Fraction in the Solution

To determine the mass fraction of the dissolved substance in the resulting solution, we need to calculate the total mass of the solution and the mass of the dissolved substance.

Let's assume that the dissolved substance is represented by X.

Given: - 150 grams of a 20% solution - 350 grams of a 10% solution

To calculate the mass fraction, we need to find the total mass of the resulting solution and the mass of the dissolved substance.

Calculation Steps:

1. Calculate the mass of the dissolved substance in the 20% solution: - Mass of the dissolved substance in the 20% solution = 20% of 150 grams - Mass of the dissolved substance in the 20% solution = 0.20 * 150 grams

2. Calculate the mass of the dissolved substance in the 10% solution: - Mass of the dissolved substance in the 10% solution = 10% of 350 grams - Mass of the dissolved substance in the 10% solution = 0.10 * 350 grams

3. Calculate the total mass of the resulting solution: - Total mass of the resulting solution = mass of the 20% solution + mass of the 10% solution - Total mass of the resulting solution = (mass of the dissolved substance in the 20% solution + mass of the solvent in the 20% solution) + (mass of the dissolved substance in the 10% solution + mass of the solvent in the 10% solution)

4. Calculate the mass fraction of the dissolved substance in the resulting solution: - Mass fraction of the dissolved substance = (mass of the dissolved substance in the 20% solution + mass of the dissolved substance in the 10% solution) / total mass of the resulting solution

Let's perform the calculations:

1. Mass of the dissolved substance in the 20% solution: - Mass of the dissolved substance in the 20% solution = 0.20 * 150 grams = 30 grams

2. Mass of the dissolved substance in the 10% solution: - Mass of the dissolved substance in the 10% solution = 0.10 * 350 grams = 35 grams

3. Total mass of the resulting solution: - Total mass of the resulting solution = (mass of the dissolved substance in the 20% solution + mass of the solvent in the 20% solution) + (mass of the dissolved substance in the 10% solution + mass of the solvent in the 10% solution) - Total mass of the resulting solution = (30 grams + 120 grams) + (35 grams + 315 grams) - Total mass of the resulting solution = 150 grams + 350 grams - Total mass of the resulting solution = 500 grams

4. Mass fraction of the dissolved substance in the resulting solution: - Mass fraction of the dissolved substance = (mass of the dissolved substance in the 20% solution + mass of the dissolved substance in the 10% solution) / total mass of the resulting solution - Mass fraction of the dissolved substance = (30 grams + 35 grams) / 500 grams - Mass fraction of the dissolved substance = 65 grams / 500 grams

Therefore, the mass fraction of the dissolved substance in the resulting solution is 13%.

Please note that the calculations provided above are based on the given information and assumptions.