Question

59 БАЛЛОВ! к 450 граммам 23%-ного раствора ортофосфорной кислоты добавили 250 граммов воды. рассчитайте массовую долю растворённого вещества в образовавшемся растворе (ответ округлите до десятых).

Answer 1

Ответ:

14,8%

Объяснение:

в фото

Answer 2

Calculation of Mass Fraction of Dissolved Substance

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

Given: - Initial mass of the 23% orthophosphoric acid solution: 450 grams - Mass of water added: 250 grams

To calculate the mass of the dissolved substance, we can use the following formula:

Mass of dissolved substance = Initial mass of solution - Mass of water added

Mass of dissolved substance = 450 grams - 250 grams = 200 grams

Now, we can calculate the total mass of the resulting solution:

Total mass of solution = Initial mass of solution + Mass of water added

Total mass of solution = 450 grams + 250 grams = 700 grams

Finally, we can calculate the mass fraction of the dissolved substance using the formula:

Mass fraction of dissolved substance = (Mass of dissolved substance / Total mass of solution) * 100

Mass fraction of dissolved substance = (200 grams / 700 grams) * 100 = 28.57%

Therefore, the mass fraction of the dissolved substance in the resulting solution is approximately 28.6% when rounded to the tenths place.