Cho 14,88 gam hỗn hợp X gồm Fe3O4 và Fe tan hết trong dung dịch HNO3. Sau khi phản ứng kết thúc thu được dung dịch A và 3,528 lít khí NO (là sản phẩm khử duy nhất của , ở đktc). Cô cạn dung dịch sau phản ứng thì thu được 53,895 gam muối khan. Phần trăm khối lượng Fe3O4 trong X gần nhất với giá trị nào sau đây?         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  My father takes the ___________ for teaching us to study in the evening so that our homework has been finished before bedtime.
   

• Choose the best answer for the following sentence:

  The boy learns hard in his ____________ to be the top in every exam, which will leave a good impression on his girlfriend.

   

• Choose the best answer for the following sentence:

  Can you explain why some people can work better when they are __________ pressure?
   

• Choose the best answer for the following sentence:

  Although my dad is busy with his work, he is willing to ____________ hand with the housework.
   

• Choose the best answer for the following sentence:

  ___________ other boys of the same age who are crazy about computer games, my brother spends his free time experimenting in the lab.
   

• Choose the best answer for the following sentence:

  Weekend in my family is the time when mother and daughter cook meals whereas father and son _________ broken things around the house.
   

• Choose the best answer for the following sentence:

  Whatever you do, I am by your side to give ____________.
   

• Choose the best answer for the following sentence:

  A ___________ studies living things and works with plants and animals.
  

• Choose the best answer for the following sentence:

  Whenever a problem __________, we try to discuss and find solution as soon as possible.
   

• Choose the best answer for the following sentence:

  Children are told to be __________ for the whole week and promised to be rewarded at weekends.