Calculate atomic mass ?? When argon is 3 times heavy as an atom of carbon 12?

To calculate the atomic mass of argon when it is 3 times heavier than an atom of carbon-12, we first need to determine the atomic mass of carbon-12.

The atomic mass of carbon-12 is defined as 12 atomic mass units (amu).

Since argon is 3 times heavier than carbon-12, the atomic mass of argon would be 3 times the atomic mass of carbon-12:

Atomic mass of argon = 3 x 12 amu = 36 amu

Therefore, the atomic mass of argon when it is 3 times heavier than an atom of carbon-12 is 36 atomic mass units.