Question

What is the mass (in amu) of 100 12c atoms? ________ of 100 13c atoms?________

Answer 1

The mass of 100 12C atoms is 1200 amu, and the mass of 100 13C atoms is approximately 1300 amu.

Step-by-step explanation:

The student is asking about the mass of atoms in atomic mass units (amu). The mass of one 12C atom is defined as 12 amu, and the mass of one 13C atom is approximately 13 amu, as the mass number suggests.

For 100 atoms of 12C, the total mass would be:

• 100 atoms × 12 amu/atom = 1200 amu

Similarly, for 100 atoms of 13C, the total mass would be:

• 100 atoms × 13 amu/atom = 1300 amu

It is important to note that the actual mass of 13C may have slight decimal variations due to the exact isotopic mass (13.003355 amu), but for simplification, we consider it as 13 amu in this context.