Question

1. how many moles of fe are there in 12.0 grams cl₂?

Explanation:

Step1: Find molar mass of Cl₂

The molar mass of Cl is 35.45 g/mol, so for Cl₂ it's $2\times35.45 = 70.9$ g/mol.

Step2: Calculate moles of Cl₂

$n=\frac{m}{M}=\frac{12.0\ g}{70.9\ g/mol}\approx0.169$ mol. There is no relation given between Fe and Cl₂ in the question to find moles of Fe from moles of Cl₂. Assuming there is a reaction like $2Fe + 3Cl₂=2FeCl₃$, from the stoichiometry, if we know moles of Cl₂ we can find moles of Fe. But as per current question data, we can only find moles of Cl₂.

Answer:

The question as - is has insufficient data to find moles of Fe. If considering reaction stoichiometry, more information is needed.