You're asking for the atomic mass of argon in grams, but that's not quite the right way to think about it. Here's why:

* Atomic Mass Units (amu): The atomic mass of an element is usually expressed in atomic mass units (amu). Argon's atomic mass is approximately 39.948 amu.

* Grams per Mole: The atomic mass in amu is numerically equal to the molar mass in grams per mole (g/mol). This means that 1 mole of argon atoms has a mass of approximately 39.948 grams.

Therefore, it's more accurate to say that the molar mass of argon is 39.948 g/mol, not the atomic mass in grams.