Question

Смешали два раствора азотной кислоты: 300 г. 20%-ого раствора и 150 г. 20%-ого раствора. Вычислите массовую долю вещества в новом растворе. Очень кратко пожалуйста.

Answer 1

Вопрос не по химии, а по чтению 1 класс:

Дано: Взяли раствор 20%-ной концентрации.

Вопрос: Какой концентрации взяли раствор?

Ответ: Взяли раствор 20%-ной концентрации.

Answer 2

Calculation of Mass Fraction in the New Solution

To calculate the mass fraction of the substance in the new solution, we need to consider the amounts of the two nitric acid solutions that were mixed.

The first solution is a 20% solution with a mass of 300 grams. The second solution is also a 20% solution with a mass of 150 grams.

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

The total mass of the new solution is the sum of the masses of the two solutions: 300 grams + 150 grams = 450 grams.

To find the mass of the substance in the new solution, we need to calculate the sum of the masses of the substances in the two solutions. Since both solutions are 20% solutions, the mass of the substance in each solution is 20% of the total mass of the solution.

For the first solution: 20% of 300 grams = 0.2 * 300 grams = 60 grams.

For the second solution: 20% of 150 grams = 0.2 * 150 grams = 30 grams.

Therefore, the mass of the substance in the new solution is 60 grams + 30 grams = 90 grams.

Now, we can calculate the mass fraction of the substance in the new solution by dividing the mass of the substance by the total mass of the solution and multiplying by 100%.

Mass fraction = (mass of substance / total mass of solution) * 100%

Mass fraction = (90 grams / 450 grams) * 100% = 20%

The mass fraction of the substance in the new solution is 20%.