Answer: Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.
There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.
Explanation:
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V=0.7 l
c=0.33 moles/l
n(HCl)=v·c
n(HCl) = 0.7 l · 0.33 moles/l = 0.231 moles
0.231 moles of HCl are present