What is the mass of 6.02 x 10^22 atoms of argon?

The answer is: 3.99g

First, we need to look for the Argon molecular mass:

Then, we must remember that 1 mol of an element is equal to of the same element.

So,

To know what is the mass of atoms of Ar, we need to do the following calculations:

So the mass of atoms of Argon is 3.99g.

Have a nice day!

answer; /// i do believe that the correct answer is (a) boiling