Question

В 100г воды растворили 20г фосфорной кислоты Найдите массовую долю кислоты в полученном растворе

Answer 1

W=m(в-ва)*100%/m(р-ра)
m(р-ра)=100+20=120 г
W=20*100/120=16.7% (округлил)
Ответ: 16.7%

Answer 2

Calculating the Mass Fraction of Phosphoric Acid in the Solution

To find the mass fraction of phosphoric acid in the solution, we can use the formula:

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

Given: - Mass of water (solvent) = 100g - Mass of phosphoric acid (solute) = 20g

Using the given values, we can calculate the mass fraction of phosphoric acid in the solution.

Mass fraction of phosphoric acid = (20g / (100g + 20g)) * 100%

Mass fraction of phosphoric acid = (20g / 120g) * 100%

Mass fraction of phosphoric acid = (1/6) * 100%

Mass fraction of phosphoric acid = 16.67%

Therefore, the mass fraction of phosphoric acid in the solution is 16.67%.