Hóa hơi 8,64 gam hỗn hợp gồm một axit no, đơn chức, mạch hở X và một axit no, đa chức Y (có mạch cacbon hở, không phân nhánh) thu được một thể tích hơi bằng thế tích của 2,8 gam N2 (đo trong cùng điều kiện nhiệt độ, áp suất). Đốt cháy hoàn toàn 8,64 gam hỗn hợp hai axit trên thu được 11,44 gam CO2. Phần trăm khối lượng của X trong hỗn hợp ban đầu là  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  That was the shape of an old lady and held firmly in her hands what _____________ a walking stick.
  
  

• Choose the best answer for the following sentence:

  I declined the offer as I ____________ it was time for me to go for a swim in the sea.
  
  

• Choose the best answer for the following sentence:

  Before they left, meaningful glances ____________ between my aunt and uncle as if they both expected to hear some news from me when they got back.
   

• Choose the best answer for the following sentence:

  As they left, my uncle turned and said, "You ___________, at what happens, while we are away."
   

• Choose the best answer for the following sentence:

  When they returned, my uncle _______________ by the news that the little old lady had made an appearance.
  
  

• Choose the best answer for the following sentence:

  Till his dying day he ____________ all visitors with the story of the ghostly lady and then added with a broad grin, "It is not just me, you know, the story _____________ by my nephew."
  
  

• Choose the best answer for the following sentence:

  Well, I ______________ a lovely holiday there, they were both very kind to me and no harm was done.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  ballet                         eject                        shot                       post

• Choose the word that has the underlined part pronounced differently from the rest:

  against                          awful                              ahead                      award

• Choose the word that has the underlined part pronounced differently from the rest:

  plumber                           doubt                         climb                           scuba