Question

К РАСТВОРУ АЗОТНОЙ КИСЛОТЫ МАССОЙ 150 ГРАММ С МАССОВОЙ ДОЛЕЙ HNO3 РАВНОЙ 0,10 ДОБАВИЛИ ЕЩЁ 350 ГРАММ РАСТВОРА ЭТОЙ ЖЕ КИСЛОТЫ С МАССОВОЙ ДОЛЕЙ HNO3 РАВНОЙ 0,20. ОПРЕДЕЛИТЕ МАССОВУЮ ДОЛЮ АЗОТНОЙ КИСЛОТЫ В КОНЕЧНОМ РАСТВОРЕ (УМОЛЯЯЯЯЯЯЮ*)

Answer 1

$m_1=150g\\w_1=0,10\\m_2=350g\\w_2=0,20\\w_3=?\\1)m_1+m_2=m_3\\150+350=500\\2)w_1=\frac{x_1}{m_1}=>0,10=\frac{x}{150}=>x=15\\3)w_2=\frac{x}{m_2}=>0,20=\frac{x_2}{350}=>x=70\\3)x_1+x_2=x_3\\15+70=85\\4)w_3=\frac{x_3}{m_3}=\frac{85}{500}=0,17\\w_3=0,17$

Answer 2

Calculating the Mass Fraction of Nitric Acid in the Final Solution

To calculate the mass fraction of nitric acid in the final solution, we can use the formula:

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

Given: - Initial mass of nitric acid solution = 150 grams - Initial mass fraction of nitric acid = 0.10 - Additional mass of nitric acid solution added = 350 grams - New mass fraction of nitric acid = 0.20

Using the given data, we can calculate the mass fraction of nitric acid in the final solution.

Calculation

1. Calculate the mass of nitric acid in the initial solution: - Initial mass of nitric acid = 150 grams - Initial mass fraction of nitric acid = 0.10 - Mass of nitric acid in the initial solution = 150 grams * 0.10 = 15 grams

2. Calculate the mass of nitric acid in the additional solution added: - Additional mass of nitric acid solution added = 350 grams - New mass fraction of nitric acid = 0.20 - Mass of nitric acid in the additional solution = 350 grams * 0.20 = 70 grams

3. Calculate the total mass of nitric acid in the final solution: - Total mass of nitric acid = 15 grams + 70 grams = 85 grams

4. Calculate the total mass of the final solution: - Total mass of the final solution = 150 grams + 350 grams = 500 grams

5. Calculate the mass fraction of nitric acid in the final solution: - Mass fraction = (85 grams / 500 grams) * 100% = 17%

Answer

The mass fraction of nitric acid in the final solution is 17%.