Cho a gam SO3 vào 200g dung dịch H2SO4 49% thu được dung dịch có nồng độ 60%. Tìm a

Tính khối lượng dung dịch NaOH 20% và Ba(OH)2 8,55% cần để trung hòa 224g dung dịch HNO3 4,5M (D=1,12g/ml).

Cho từ từ 500ml dung dịch Ba(OH)2 3M vào dung dịch FeCl3 2M cho đến khi phản ứng xảy ra hoàn toàn. Lọc lấy kết tủa đem nung đến khối lượng không đổi thu được mg chất rắn

a) Tính thể tích FeCl3 cần dùng?

b) Tính m?

c) Tính Cm dung dịch thu được?

1. He said, " I must go next week."

He said ............................................. .

2. He said to me, "When you are at the butcher's, remember to get a bone for the dog."

He told .................................................... .

3. She said, "I will answer the phone."

She said .............................................. .

4. Nam said, "I am told to be at school before 7 o'clock."

Nam said that ........................................ .

5. Peter said, "My parents are very proud of my good marks."

Peter said that ......................................... .

1. The exercises were such difficult that we couldn't do them.

A B C D

2. I wish you can help me with that difficult problem.

A B C D

3. She was so lazy that she punished by her teacher.

A B C D

4. In the afternoon we went to boat in the river.

A B C D

5. I got up late this morning, that I didn't have time for breakfast.

A B C D

1. He has a great ....................... of foreign stamps.( collect)

2. She spent a ....................... evening with her friends.(relax)

3. He has been a political .......................... for ten years.(comment)

4. King Quang Trung was one of our great .................. (hero)

5. He is a great ....................... of Picasso's early paintings.( admire)

Hòa tan 9,6g hỗn hợp Canxi và Canxioxit vào nước. Sau phản ứng thu được 2,24 lít khí ở đktc.

a) Tính khối lượng chất tan có trong dung dịch thu được

b) Tính phần trăm mỗi chất có trong hỗn hợp ban đầu.

1. Children seem to have lost their ...................... in reading.(enjoy)

2. Most of the .......................... have lived here all their lives. (village)

3. She listens to classical music for ................... (relax)

4. I find this piece of music very ..................... (rest)

5. He made a ..................... of Roman coins and medals. (collect)

1. We spent an .............................. afternoon boating in the river. (enjoy)

2. The atmosphere in the village is very ...................(rest)

3. Harry Potter is an .................... book for children, but my youngest sister is not at all .................... in it. (interest)

4. There is a small bamboo forest at the ........................ to the village.(entry).

5. We went ...................... beside the river last Sunday. (picnic)

6. The song remembers the brave ......................... who died for their country.(heroic)

7. The weekend passed ............. and we all felt very ............. .(enjoy-rest)

8. The French team was ................... not to win the match(luck)

1. The weather/ bad/ we/ not enjoy/ our holiday.

.............................................................

2. She/ be/ tired/ go/ home.

...............................................................

3. He/ work/ hard/ pass/ all his exams.

...............................................................

4. We/ want/ get a good seat/ arrive/ the cinema/ early.

.................................................................

5. Paul/ he/ very hungry/ eat/ like a horse.

...............................................................

6. I/ not have/ a computer/ not finish/ my report/ yet.

................................................................

7. He/ rather old/ can't wear/ that kind of hat.

................................................................

8. There/ be/ a herd of cow/ the street/ all the cars/ stop.

................................................................

9. No one/ watch/ the television/ I/ switch/ off

................................................................

10. The stereo/ not work/ Vicky/ take back/ the shop.

.................................................................