Khi đốt cháy một rượu đơn chức (X) thu được CO₂ và hơi nước theo tỉ lệ thể tích  = 4 : 5. Công thức phân tử của X là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Playing tennis one hour a day is ____________ .
  
  

• Choose the best answer for the following sentence:

  _____________ the right sight of a person’s brain is dominant, that person is left-handed.
  
  

• Choose the best answer for the following sentence:

  When I was at secondary school, I ______________ games with my neighbor.
  
  

• Choose the best answer for the following sentence:

  What an awful day it’s been, _______________ ?
  
  

• Choose the best answer for the following sentence:

  After doing the washing, she hangs up her clothes to make them ____________ .
  
  

• Choose the best answer for the following sentence:

  I ____________ a bath every morning. It is my habit.
  
  

• Choose the best answer for the following sentence:

  Every time he turns the radio on I can’t sleep because it is _____________ .
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

  Studies into life histories show that be a twin can lead to a very difficult life.

• Choose the correct sentence which is built from the words and phrases given:

  Observers / living / Beijing / say / appear / only / small part / one million / habitants/ escape / death / injury//.
  
  

• Choose the best answer for the following sentence:

  The streets become more and more ______ with thousands of cars running up and downs.