Answer:
hydrogen, nitrogen, oxygen, flourine, chlorine, iodine, bromine
Explanation:
they are very reactive and thus cannot exist as monoatomic elements
∆G = ∆H-T∆S
=20×10^3-(15+273)(.101×10^3)
=20000-(288)(101)
=20000-29088
=-9088 joule = -9.088 kj
Answer: 3.5 moles of hydrogen gas will be produced.
Explanation:
The balanced chemical equation is:
As HCl gets completely used up, 
is the limiting reagent.
According to stoichiometry :
6 moles of produces = 3 moles of 
Thus 7.0 moles of produces=
of
Thus 3.5 moles of hydrogen gas will be produced.
The answer is b. Mass of the atoms
This is because of the law of conservation of mass. This means the mass in a system (in this case the reaction) can't change, so the quantity can't be added or removed
