Giúp mình vs

1. I don’t find it difficult to study late at night.

→ I am used …………………………………………………………………………………

2. I’ve never met such a famous person before.

→ I2. I’ve never met such a famous person before.

→ It is ………………………………………………………………………………………..

3 We don’t buy the house because we don’t have enough money.

      → If we …….........................................………………………………………………………

4. Only two out of the five rooms we have booked have air conditioners.

→ We have booked five rooms, only two ............................................................................................

5. “Don’t walk in the sun without your hat”. His mother said

→ His mother asked …………………………………………………………………………

6. Nobody finished their exercises on time.

→ Their exercises ……………………………………………………………………………

7. Because of his poverty, Mike had to leave school at the age of fourteen.

→ Because Mike …………………………………………………………………………….

8. She never seems to succeed, even though she works hard.

      → Hard …………..........................………………………………………………….

9. That car was too expensive for us to buy.

      → We couldn’t.………………………………….…………………………………………..

10. Walking on the grass is not permitted here.

→ You are …….……………………………………………………………………………...

11. Hoan Kiem Lake is nice. The water of the lake is clean

      → Hoan Kiem Lake..................................................................................................................

12. Would you mind not smoking in here?

      → I’d rather ...........................................................................................................................

13. It is said that he escaped to a neutral country.

     → He .....................................................................................................................................

14. Tom had difficulty concentrating on his book because of the noise.

     → Tom found........................................................................................................................

15. I should like someone to take me out to dinner.

     → What I should …………………………………………………………........................

16. He brought the umbrella along but it didn't rain.

     → He needn't ...........................................................................................................................................

1. In ancient Greece, the owl was a symbol of __________________.                                REFUSE                                                            

2. I couldn’t help it. The accident was __________________.                                 AVOID

3. She was _____________ knowledgeable about the history of China.                              EXTREME

4. He was very_______________ when his cat was run over.                                              SET

5. Jackson had another violent _______________ with the referee.                                                AGREE

6. Many people were buried ______________ after the earthquake.                                   LIVE

7. She studied ______________ at university.                                                                      ECONOMY

8. Rob was dismissed by his_______________ that he must leave in a month’s time. EMPLOY

9. The judge told him it was ___________ to drink and drive, and banned him for a year. RESPONSIBLE

10. English is a ___________________easy language for us to learn.                           COMPARE

11. Some young people today have a very strange ___________________.                   APPEAR

12. Many designers took __________________ from Vietnam’s ethnic minorities.             INSPIRE

13. He has great _________________ in God.                                                                        BELIEVE

14. She divorced him because of his _______________________ to the children.              KIND

15. Women nowadays have more _________________ to participate in social activities.          FREE

16. English and French are Canada’s _____________________ language.                           OFFICE

17. I had my trouser ___________________ because it is too short.                                    LONG

18. _____________________ is a source of income for radio, TV and newspapers.    ADVERTISE

19. There used to be a big tree at the ____________________ to this village.                         ENTER

20. Jeans made in China are sometimes ______________ cheap.                                        SURPRISE

a)CH4 + 2O2 →→ CO2 + 2H2O (1)

2H2 + O2 →→ 2H2O (2)

b) Đặt nCH4 = a (mol) , nH2 = b (mol)

=> mCH4 = 16a(g) , mH2 = 2b(g)

mà n(CH4 + H2) = V/22,4 = 6,72/22,4 = 0,3(mol)

=> a + b = 0,3(mol) => a = 0,3 - b

Từ PT(1) => nO2 = 2nCH4 = 2a(mol)

Từ PT(2) => nO2 = 1/2 . nH2 = 1/2 . b (mol)

=>tổng nO2 = 2a + 1/2.b (mol)

=> mO2 = n .M = 32. (2a+ 1/2.b )= 64a + 16b(g)

Theo ĐLBTKL:mCH4 + mH2 + mO2 = mCO2 + mH2O(PT1,2)

=> 16a + 2b+ 64a +16b = 11,6

=> 80a + 18b = 11,6

=> 80. (0,3 - b ) + 18b = 11,6

=> b = 0,2(mol)

=> a = 0,3 - 0,2 = 0,1(mol)

=>mCH4 = 16a = 16. 0,1 = 1,6(g) , mH2 = 2b = 2 . 0,2 = 0,4(g)

=> VCH4 = n .22,4 = 0,1 . 22,4 =2,24(l)

VH2 = n . 22,4 = 0,2 . 22,4 = 4,48(l)

tự tính ... 

c) nO2 = 2a + 1/2 .b = 2 . 0,1 + 1/2 . 0,2 = 0,3(mol)

=> VO2 = 0,3 . 22,4 =6,72(l)

mà VO2 = 20% Vkk

=> Vkk = 6,72 : 20% =33,6(l)
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