bạn xem lại xem 13.5(g) hay 13.8g nhé ^^ ,cho tròn số ý mà

CuCl2+2NaOH->Cu(OH)2+2NaCl

nCuCl2=13.5:138=0.1(mol)

nNaOH=20:40=0.5(mol)

theo pthh:nNaOH=2nCuCl2

theo bài ra,nNaOH=5 nCuCl2->NaOH dư tính theo CuCl2

theo pthh,nCu(OH)2=nCuCl2->nCu(OH)2=0.1(mol)

mCu(OH)2=0.1*98=9.8(g)

b)PTHH:Cu(OH)2+2HCl->CuCl2+2H2O

theo pthh:nHCl=2nCu(OH)2->nHCl=0.1*2=0.2(mol)

mHCl=0.2*36.5=7.3(g)

mDD HCl=7.3*100:10=73(g) 

C

Virus cúm (Influenza virus) thuộc họ Orthomyxoviridae, hình khối cầu, gồm 3 tuýp A, B, C. Trong đó, virus cúm A, B chủ yếu gây bệnh cho người, riêng virus cúm A được nghiên cứu nhiều hơn do hay gặp dịch lớn. Virus này dễ biến đổi kháng nguyên và xuất hiện nhiều chủng mới trong quá trình tiến triển của các vụ dịch.

1. Minh / ever / take part in /a community activity.

Minh ever takes part in a community activity.

2. My brother/ start / play the guitar / a year ago.

My brother started playing the guitar a year ago

3. She / have / stomachache.

She has stomachache

4. My father / enjoy / ride/ his bike to work.

My father enjoys riding his bike to work

5. I / want / eat / some fried rice, but I / have / sore throat.

I want to eat some fried rice, but I have a sore throat

6. He / be / in hospital / because / he / have / a temperature of 41⁰ C.

He is in the hospital because he has a temperature of 41⁰ C.

    7. Nam/ ẹnjoy / ride / his bike to work

Nam enjoys riding his bike to work

8. you / finish / project / yet ?

Have you finished your project yet?

9. My brother / start / play / guitar / five years ago.

My brother started playing the guitar 5 years ago

10. We/ last meet / him / when / W / be / Da Nang.

We last met him when we were in Da Nang

11. Mary / have / stomachache.

mary has a stomachache

12. Mr. Binh / keep/ sneeze / and cough./ I think he / have / flu.

Mr Binh keeps sneezing and coughing, I think he has a flu

13. Hung / ever / take part in /a community activity.

Hung ever takes part in a community activity

14. My father / hate / watch/ detective film.

My father hates watching detective film

15. I / want / eat / some fried rice, but I / have / sore throat.

I want to eat some fried rice, but I have a sore throat

16. I / be / in hospital / because / I / have / a temperature of 40⁰ C.

I am in the hospital because I have a temperature of 40⁰ C.

1 A

2 D

3 C

4 A

5 B

6 A

7 C

8 A

1 In my opinion

2 also

3 I think

4 In addition to

5 Beside

6 As I note

C. Tiểu cầu

Tế bào vi khuẩn Ecoli

D

D