Question

the atomic mass of carbon - 12 is amu. the atomic mass of carbon - 13 is amu. the natural abundance of carbon - 12 is percent.

Explanation:

Step1: Recall atomic mass definitions

The atomic mass of Carbon - 12 is defined as 12 amu. This is a standard definition in chemistry.

Step2: Recall Carbon - 13 atomic mass

Carbon - 13 has an atomic mass of approximately 13.0033548378 amu. This is based on its isotopic composition and mass spectrometry measurements.

Step3: Recall natural abundance of Carbon - 12

The natural abundance of Carbon - 12 is about 98.93 percent. This is determined by analyzing the relative amounts of carbon isotopes in nature.

Answer:

12, 13.0033548378, 98.93