Answer:
I think section #3
Explanation:
When i was in science class in my memory it was always in that area
Answer: 16.32 g of 
as excess reagent are left.
Explanation:
To calculate the moles :
According to stoichiometry :
2 moles of 
require = 1 mole of
Thus 0.34 moles of will require=
of
Thus is the limiting reagent as it limits the formation of product and is the excess reagent.
Moles of left = (0.68-0.17) mol = 0.51 mol
Mass of 
Thus 16.32 g of as excess reagent are left.
Chlorine is more reactive than argon, because argon is not reactive at all. Chlorine only has to gain 1 valence electron
I am sorry I don't know, points are points though
