Final answer:
1.0 mol of mercury (Hg) atoms has the greatest mass of 200.59 grams.
Step-by-step explanation:
The question asks which of the following has the greatest mass. To determine this, we need to calculate the mass of each option.
A 1 atom of gold (Au) has a molar mass of 196.97 g/mol. Therefore, the mass of 1 atom of gold is 196.97 g/mol.
1.0 mol of mercury (Hg) atoms has a molar mass of 200.59 g/mol. Therefore, the mass of 1.0 mol of mercury atoms is 200.59 g/mol.
2.0 mole of chlorine (Cl) atoms has a molar mass of 35.45 g/mol. Therefore, the mass of 2.0 mole of chlorine atoms is 70.90 g/mol.
25 atoms of mercury (Hg) have a molar mass of 200.59 g/mol. Therefore, the mass of 25 atoms of mercury is 5014.75 g/mol.
Comparing the masses, we can see that 1.0 mol of mercury atoms has the greatest mass with 200.59 grams.