Question

1. how many grams of cl₂ are there in 1.25 mol cl₂?

Explanation:

Step1: Find molar mass of Cl₂

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

Step2: Calculate mass

Mass = moles × molar - mass. So mass of Cl₂ = $1.25\ mol\times70.9\ g/mol$.
$1.25\times70.9 = 88.625$ g.

Answer:

88.625 g