Question

смешали 150 г раствора серной кислоты с массовой долей 20% и 140 г 50% - го раствора того же вещества. Определите массовую долю кислоты в % в полученном растворе. ответ округлите до целых​

Answer 1

Ответ:

масса кислоты в растворе после смешения:

m(H₂SO₄) = 150*0,2 + 140*0,5 = 100г

масса раствора после смешения равна 150 + 140 = 290г

ω(кислоты) = m(H₂SO₄) /m(раствора)

ω(кислоты) = 100г/290г = 0,344

или 34,4%

после округления: 34%

Объяснение:

Answer 2

Calculating the Mass Fraction of Acid in the Solution

To determine the mass fraction of acid in the resulting solution, we can use the following approach:

1. Calculate the total mass of the resulting solution: - The total mass of the resulting solution is the sum of the masses of the two initial solutions that were mixed together.

2. Calculate the total mass of acid in the resulting solution: - This can be calculated by adding the masses of acid from the two initial solutions.

3. Determine the mass fraction of acid in the resulting solution: - The mass fraction of acid in the resulting solution is the ratio of the total mass of acid to the total mass of the resulting solution, expressed as a percentage.

Let's proceed with the calculations.

Calculation Steps

1. Calculate the total mass of the resulting solution: - Total mass = Mass of 20% solution + Mass of 50% solution - Total mass = 150 g + 140 g - Total mass = 290 g

2. Calculate the total mass of acid in the resulting solution: - Mass of acid from the 20% solution = 20% of 150 g - Mass of acid from the 20% solution = 0.20 * 150 g - Mass of acid from the 20% solution = 30 g

- Mass of acid from the 50% solution = 50% of 140 g - Mass of acid from the 50% solution = 0.50 * 140 g - Mass of acid from the 50% solution = 70 g

- Total mass of acid = Mass of acid from 20% solution + Mass of acid from 50% solution - Total mass of acid = 30 g + 70 g - Total mass of acid = 100 g

3. Determine the mass fraction of acid in the resulting solution: - Mass fraction of acid = (Total mass of acid / Total mass of resulting solution) * 100% - Mass fraction of acid = (100 g / 290 g) * 100% - Mass fraction of acid ≈ 34.48%

Answer

The mass fraction of acid in the resulting solution is approximately 34%.