Question

ПОМОГИТЕ ПОЖАЛУСТА!!!!!!!! СРОЧНОООО!!!!!!!!!! В 450 г воды растворили 15 г пищевой соды, 25 г поваренной соли и 7 г сахара. Вычислите массовые доли соды и сахара в полученном растворе.

Answer 1

Ответ:

Дано:

m(H₂O) = 485г

m(caxapa) = 15г

Найти:

w(caxapa)

Решение:

m(p-pa) = m(H₂O) + m(caxapa) = 485+15 = 500г

w(caxapa) = % = 3%

Ответ: w(caxapa) = 3%

Объяснение:

держи

Answer 2

Calculation of Mass Fractions

To calculate the mass fractions of baking soda (sodium bicarbonate) and sugar in the solution, we need to determine the total mass of the solution and the individual masses of each component.

Given: - Mass of water = 450 g - Mass of baking soda = 15 g - Mass of table salt (cooking salt) = 25 g - Mass of sugar = 7 g

To find the total mass of the solution, we add the masses of water, baking soda, table salt, and sugar:

Total mass of the solution = Mass of water + Mass of baking soda + Mass of table salt + Mass of sugar

Total mass of the solution = 450 g + 15 g + 25 g + 7 g

Total mass of the solution = 497 g

Now, we can calculate the mass fractions of baking soda and sugar in the solution.

Mass fraction of baking soda: Mass fraction is calculated by dividing the mass of baking soda by the total mass of the solution and multiplying by 100%:

Mass fraction of baking soda = (Mass of baking soda / Total mass of the solution) * 100%

Mass fraction of baking soda = (15 g / 497 g) * 100%

Mass fraction of baking soda ≈ 3.02%

Mass fraction of sugar: Similarly, the mass fraction of sugar is calculated by dividing the mass of sugar by the total mass of the solution and multiplying by 100%:

Mass fraction of sugar = (Mass of sugar / Total mass of the solution) * 100%

Mass fraction of sugar = (7 g / 497 g) * 100%

Mass fraction of sugar ≈ 1.41%

Therefore, the mass fraction of baking soda in the solution is approximately 3.02%, and the mass fraction of sugar is approximately 1.41%.

Please note that these calculations assume that the volumes of the components are additive and that there is no significant change in volume upon dissolution.