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9 tháng 8 2017

V/ chọn và sửa lỗi sai

1. When(1) Mrs. Brown looked out(2) , she saw the children played(3) near the swimming pool

->were playing

2. Only(1) chinese has more(2) native speakers than(3) English. This is because(4) the huge population of China

=>because of

3. The school library is(1) free and(2) open for(3) all the pupils and teaching staff(4)

=>staffs

4. There wasn't some(1) directory in the(2) telephone box from which(3) injured man was phoning(4)

=>any

5. She wanted me to tell(1) her about(2) what i was doing(3) here and how was my life(4)

=> my life was

6. These engines used being(1) started by hand(2). But now(3) they are(4) started by electricity

=>to be

7. The ao dai consists of(1) a long silk tunic that is(1) slit on(2) the sides and wore(3) over loose pants

=>worn

8. The artist wad very pleased(1) and thanked the farmer for(2) saying so(3) kind things about(4) the paintings

=>such

11 tháng 8 2017

1. Vicky (1)said she (2)didn't know (3)where Michael (4)is => was

2. The womam (1)is => bỏ ''is'' standing next (2)to our teacher (3)is (4)my mother

3. He (1)is (2)proud (3)of his (4)wise=> wisdom

4. I (1)was so (2)excitement => excited (3)about the football match (4)last night

5. She (1)lives =>lived (2)in Rome (3)when she (4)was a little girl

6. He (1)will be (2)back (3)from => between 5:25 (4)and 6:20

11 tháng 8 2017

1. Vicky (1)said she (2)didn't know (3)where Michael (4)was

2. The womam (1) bỏ "is" standing next (2)to our teacher (3)is (4)my mother

3. He (1)is (2)proud (3)of his (4)wisdom

4. I (1)was so (2)excited (3)about the football match (4)last night

5. She (1) lived (2)in Rome (3)when she (4)was a little girl

6. He (1)will be (2)back (3) between 5:25 (4)and 6:20

19 tháng 12 2022

1. Could you tell me what are the problems on the delivery?

=> Could you tell me what are the problems with the delivery?         

2. who should we talk to about this broke TV?
=> who should we talk to about this broken TV

III/ rewrite each of the sentences by using the adverb clauses of result "SO"

1. We decided to leave early because the party was boring

-> The party was boring so we decided to leave early.

2. She phoned the police because she saw she wanted man in a small coffee shop

-> She saw she wanted man in a small coffee shop so she phoned the police.

3. She walked slowly because her leg was injured

-> Her leg was injured so she walked slowly.

4. Mary looked happy because she has just got good marks

-> Mary has just got good marks so she looked happy.

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)