Chất X chứa (C, H, N). Biết % khối lượng N trong X là 45,16%. Khi đem X tác dụng với HCl chỉ tạo muối có dạng RNH₃Cl. X là:

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Một số câu hỏi khác có thể bạn quan tâm.

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

  Tom, your chores should have been finished by the time I get home, including taking out the

  garbage.

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

  In my opinion, he maybe elected because he is honest, knowledgeable and competent.

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

  I think the price of rice is getting cheap and cheaper because we had a good crop this year.

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

  After mv father gets home from work, he will like to read the evening newspaper.

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

  Since my watch has broken. I have been late for school three times.

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

  The village will have no electric power until a new generator will be installed.

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

  A hurricane’s force begins to distinguish as soon as it will strike land.

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

  When he was telling them what had happened, they thought he was madder still.

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

  She has been waiting at the airport for over an hour before she finally received a message

  telling her to go direct to her hotel.

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

  After he made sure no one was waiting for him in the hotel lobby, he had collected his key

  at the reception desk.