題組內容

Part 2. Short Answer [80 marks]

Using Mandarin to answer the short questions is allowed except question 32 and 33.

21. Urea, (H₂N)₂CO, is excreted by mammals and can be used as a fertilizer.

21g. The mass spectrum of urea is shown below. Identify the species responsible for the peaks at the mass/charge ratio (m/z) equal to 60 and 44. [2 marks]