Final answer:
The mass of a single chlorine molecule, Cl₂, is 1.177 x 10⁻²² g.
Step-by-step explanation:
The mass of a single chlorine molecule, Cl₂, can be calculated using its molar mass. The molar mass of Cl₂ is 70.90 g/mol, which means that one mole of Cl₂ weighs 70.90 grams. The formula Cl₂ indicates that there are two chlorine atoms in one molecule, so to find the mass of a single chlorine molecule, we divide the molar mass by Avogadro's number (6.022 × 10²³):
Mass of a single Cl₂ molecule = 70.90 g/mol / (6.022 × 10²³) = 1.177 × 10⁻²² g
Therefore, the correct answer is D) 1.177 x 10⁻²² g.