Để xác định nhiệt nóng chảy của thiếc, người ta đổ 350 g thiếc nóng chảy ở nhiệt độ 232°C vào 330 g nước ở 7°C đựng trong một nhiệt lượng kế có nhiệt dung bằng 100 J/K. Sau khi cân bằng nhiệt, nhiệt độ của nước nước trong nhiệt lượng kế là 32° Tính nhiệt nóng chảy của thiếc. Biết nhiệt dung riêng của nước là 4,2 J/g.K, của thiếc rắn là 0,23 J/g.K.

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  "I saw her in the park two hours ago," said he.
   

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

  "Joe has a lot on his mind, " Mrs Baker said.
  
  

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

  I'll break a promise if I tell you her name.
  
  

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

  "I'm leaving here for Da Lat next week," said Mrs Lan.
  
  

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

  Though her difficult living condition, Marie worked extremely hard to earn a degree.

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

  A United Nations tried to solve some global environmental problems.

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

  I really think that apologizing is a little you can do now.

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

  seafood                   release                    threaten                 beneath  

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

  however                   know                      follow                    show
  
  

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

  careful                         atmosphere                        share                       everywhere