That's what I thought too! But it's Cl2? So don't I multiply or divide by 2 or something......
well, u would divide the moles by 2 only if they ask for number of atoms of Cl in Cl2 , however if they ask number of molecules of cl2 in x grams, then u dont divide.
u DONT divide grams and then find moles noo! u find moles then divide by 2.
example q:number of atoms of S in S8 as 2grams, you find mole of S8 so: g/mr > 2/(8x32.1) = 0.25 mol then u divide 0.25/8 =0.0311 mol [for one S]
then 0.0311 mol x avagadros constant for number of atoms of S in 2g of S8
but i advice u also ask ur teacher, its been a while since i did chem but from what i can remember this is how its done.
if they ask for ex. for number of molecules of S8 in x grams, then u do the method i mentioned before.