Предмет: Химия, автор: angelinalyasch

Рассчитать сколько необходимо взять воды и соли, чтобы приготовить раствор m=50 г , с W=5%?

Ответы

Автор ответа: katerina0354

Дано: mраствора(HCl)=50 г; W(HCl)=5%
m(HCl)=W*mраствора=0,05*50=2,5 г
m(H2O)=W(H2O)*mраствора=0,95*50=47,5 г

Автор ответа: angelinalyasch

Спасибо..Большое

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: nastarudik0

англ. мова
.......................

6 лет назад

Предмет: Английский язык, автор: Alonzo8987

№1. fossil fuels, footpath, special offer, unpredictable, extinct, global warming, youth, freezing, competitors, rise

1. There’s a __________ on flights to France this month.

2. It’s ________ cold today.

3. The burning of ________ produces carbon dioxide.

4. The weather is __________. You never know what to wear.

5. Many animals may become _______.

6. ________ is causing ice to melt and temperatures to ______ .

7. One of the _______ broke his leg in the wok racing.

8. We stayed in ______ hostel for a week.

9. Follow the __________ and you will find the camp.

№2. Choose the preposition.

1. Many animals are in/ under threat.

2. They adapted to/ in the dark conditions.

3. He was singing loudly to scare by/ off bears.

4. Wear more clothes instead of turning off/ up the heat.

5. They warned me about/ of his bad behavior.

№3. Word formation. Fill in the correct word derived from the words in CAPITALS.

1. Extreme sports like roofing are ___________. (DANGER)

2. She looks ________ . (ATHLETE)

3. The salad is very ________ . (SALT)

4. This hotel is very _______. (EXPENSE)

5. Enjoy this ____ beauty. (NATURE)

6. Scientists say robots could be rather ____ in the future. (FUNCTION)

7. I like to travel with him by car. He is a very _____ driver. (CARE)

8. The sofa looks _______. I’d like to buy it. (COMFORT)

9. I’m _____ to oranges. That’s why I avoid eating them. (ALLERGY)

№4. Choose the correct item.

1. I promise I ____ to the library after school.

a) am going b) will go c) go

2. Tom _____ on a trip this weekend.

a) going to go b) is going c) goes

3. My train _______ at 9:00 tomorrow.

a) leaves b) will leave c) is leaving

4. We _____ dinner at a restaurant at 7p.m. I booked a table yesterday.

a) have b) will have c) are having

5. Don’t worry. I _____ you to do the task.

a) help b) am helping c) will help

6. If you heat water, it ______

a) boils b) will boil c) boil

7. If you study hard, you ____ the exam.

a) would pass b) would have passed c) will pass

№5. Communication. Match 1-6 to A-F.

1. How can I help you?

2. Can I book it, please?

3. Does that include breakfast?

4. How much is it per night?

5. How about joining me for a game?

6. We look forward to seeing you.

A. Thank you. Goodbye.

B. It’s 100 $

C. I’d like to book a room, please.

D. Sure, I’d love to!

E. Certainly. When for?

F. No, I’m sorry.

6 лет назад

Предмет: Қазақ тiлi, автор: sailaubajtuleuhanlv

3. «Ең мәдениетті журналист» тақырыбына есеін құрап аіr.
Синквейн құрылымы:
1) журналистің аты-жөні - зат есім.
2) журналистің шеберлігін сипаттайтын екі сын есім.
3) журналистің әрекетіне қатысты үш етістік.
4) Журналисті бағалауға қатысты төрт кілт сөз.
5) Журналистің шеберлігін сипаттайтын синоним сөздер
немесе фразеологизмдер. ✍

6 лет назад

Предмет: Информатика, автор: lyudmilaloktev

Известно число жителей, проживающих в каждом доме улицы. Нумерация домов проведена подряд. Дома с нечетными номерами расположены на одной стороне улицы, с четными — на другой. На какой стороне улицы проживает больше жителей? Использовать только один оператор цикла!
( в паскале АВС)

9 лет назад

Предмет: Химия, автор: silka83

Сколько изомеров у пентанала ?

9 лет назад