Предмет: Химия, автор: b02700

2. ДО РОЗЧИНУ масою 100 г з масовою часткою солі 20% долили 50г води. Визначте масову частку
солі в утвореному розчині.

3. 3 розчину масою 150 г з масовою часткою 20% випарили зо г води. Визначте масову частку солі
в утвореному розчині.


4. До розчину масою зоог з масовою часткою солі 10% додали 100г цiєї ж солі. Визначте масову
частку солі у новому розчині.

(пупсики, в химии вообще не бум бум, спасайте)

Ответы

Автор ответа: dyexfnf
0

Ответ:

Объяснение:

2)

m(солі) = m₁(р-ну) * w₁(солі) = 100 * 0,2 = 20 г

m₂(р-ну) = m₁(р-ну) + m(H2O) = 100 + 50 = 150 г

w₂(солі) = m(солі)/ m₂(р-ну) * 100% = 20/150 * 100% = 13,33%

3)

m(солі) = m₁(р-ну) * w₁(солі) = 150 * 0,2 = 30 г

m₂(р-ну) = m₁(р-ну) - m(H2O) = 150 - 30 = 120 г

w₂(солі) = m(солі)/ m₂(р-ну) * 100% = 30/120 * 100% = 25%

4)

m₁(солі) = m₁(р-ну) * w₁(солі) = 300 * 0,1 = 30 г

m₂(р-ну) = m₁(р-ну) + m₂(солі) = 300 + 100 = 400 г

m₃(солі) = m₁(солі) + m₂(солі) = 30 + 100 = 130

w₂(солі) = m₃(солі)/ m₂(р-ну) * 100% = 130/400 * 100% = 32,5%

Похожие вопросы
Предмет: Английский язык, автор: 52627373
Use the gerund (verb + ing) after prepositions: I am very good at remembering names and faces. 1. She had her lunch after 2. They are very excited about [ 3. He is afraid of 4. I am tired of Use the gerund (verb + ing) after phrasal verbs: She has given up smoking. 1. If you carry on 2. Do you think the thief will admit to 3. I don't want my child to grow up 4. I don't approve of all her work. (finish) to another country. (move) his job. (lose) you to put your clothes away. (tell) out late at night, you will lose your job. (stay) all the money? (steal) bad habits. (develop) people badly. (treat) Use the gerund (verb + ing) after certain verbs: mind, love, hate, like, enjoy, practise, stop, suggest Do you mind getting up early tomorrow? 1. Do you suggest 2. I wish you would stop him as a solution to the problem? (fire) so much noise. (make) 3. I enjoy 4. You must practise Use the infinitive (+ to) after adjectives. My house is very easy to find. 1. It is not very polite 2. We are happy 3. This coffee is too hot 4. It is very important Use the infinitive (+ to) to express a reason or a purpose. He is saving up his money to buy a car. 1. He is working out at the gym 2. I woke up early 3. She went to the supermarket 4. She is going to England a good action movie. (watch) your lines before you go out to play. (learn) to your teacher like that! (speak) the engagement of our daughter. (announce) at the moment. (drink) before you write exams. (study) fit. (get) a shower (have) bread and milk. (buy) to speak English. (learn)​
Предмет: Геометрия, автор: IIIIIIIOIIIIIII
Предмет: Математика, автор: babayanmary12
Предмет: Математика, автор: 12MashaFox12