Tiến hành lên men m gam tinh bột (hiệu suất toàn quá trình đạt 81%) rồi hấp thụ toàn bộ lượng CO₂ sinh ra vào nước vôi trong dư thu được 70 gam kết tủa. Giá trị m là:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  technical                    introduce                      villager                   family

• Choose the best answer for the following sentence:

  She demanded that she ___________ allowed to meet her son in prison.
   

• Choose the best answer for the following sentence:

  __________ if you take the map with you.
    

• Choose the best answer for the following sentence:

  Don't worry. You _________ told if there's a change of the plan.
   

• Choose the best answer for the following sentence:

  There has been an accident on the motorway, ___________ long delays.
   

• Choose the best answer for the following sentence:

  The house is ________ need of a thorough clean.
   

• Choose the best answer for the following sentence:

  After a lot of difficulty, he ____________ to open the door.
   

• Choose the best answer for the following sentence:

  The teacher _________ them that she was going to hold a English-speaking club.
   

• Choose the best answer for the following sentence:

  I knew him _____________ I was a child.
   

• Choose one sentence that has the same meaning as the root one:

  His wife said it was quite unusual for him to read in bed