Предмет: Химия, автор: Chillyguy

Рассчитайте массовую долю серной кислоты в растворе, где химическое кол-во кислоты 3 моль, а масса воды 200г. Даю 15 баллов​

Ответы

Автор ответа: kirillik10618
1

Ответ:

0,6=60%

Объяснение:

М(H2SO4)=98г/моль

m(H2SO4)=294г

w(H2SO4)=m(H2SO4)/m(H2SO4)+m(воды)=294г/294г+200г=294г/494г=0,5951417

округляем до: 0,6=60%

Похожие вопросы
Предмет: Қазақ тiлi, автор: muyassarmirzar
Предмет: Английский язык, автор: SilverName22
1. Fill in the correct word.

weekly ghost ruined puzzled rush knock mines worried

introduce naughty

1 Can I ............... myself? My name is Lenny

White.

2 Everything was closed. It was like a

............... town.

3 My parents buy the ............... newspapers

every Sunday.

4 Lots of men worked in coal ............... in the

nineteenth century.

5 My little sister can be very ............... at

times. She often throws things at me.

6 There were many ............... buildings in the

town that people wanted to rebuild.

7 I was ...............; I really didn’t understand.

8 His parents were ............... because he

didn’t come home.

9 I always ............... on the door before I

enter a room.

10 Everyone is in a hurry. They ...............

around everywhere all day.



10*3=30



B Match the adjectives to their opposites.

1 clean .........

2 beautiful .........

3 busy .........

4 crowded .........

5 relaxed .........

A ugly

B quiet

C stressed

D polluted

E deserted




C Write the Past Simple form of the verbs in brackets.

1 Paul ................... (find) a wallet on the bus

yesterday.

2 My brother ................... (spend) €120 on

CDs last weekend.

3 We ................... (decide) to stay in and

watch a film last night.

4 I ................... (knock) at the door but no

one was in.

5 He ................... (say) hello to me but I

don’t know who he is.

6 We ................... (meet) on holiday last

summer.

7 I ................... (hear) a lot about you.

8 Albert Einstein ................... (die) in 1955.

9 I ................... (read) an interesting article

about dogs this morning.

10 He was so happy that he ...................

(jump) up and down.





D Choose the correct response.

1 Excuse me. Is this Mr Brown’s Office?

2 Thank you very much.

3 What does it look like?

4 Here you are.

5 Do any of these look familiar?

A You’re welcome.

B Thank you.

C Yes. What can I do for you?

D It’s black with a silver handle.

E Yes, the one in the corner is mine.