How Many Ions are Present in 1 Formula Unit of HI, HBr, and N2S5?

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In the discussion, participants clarify the number of ions in different compounds: HI(aq) dissociates into H+ and I-, resulting in 2 ions, while HBr(g) does not dissociate in its gaseous state, leading to 1 molecule and no ions. The confusion around N2S5 arises from its non-existence as a stable compound, with participants concluding it would also have 0 ions since it does not dissociate. The importance of dissociation in determining the number of ions is emphasized, particularly in aqueous solutions. Overall, the key takeaway is that the state of the compound (aqueous vs. gas) significantly affects ion presence.
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Homework Statement



How many ions are present in 1 formula unit of HI(aq)?
HBr(g)?
N2S5?

Homework Equations



These two questions have the same concept, I believe.
I went the simple way and thought the answer was 2 for both of them, but apparently that was wrong. Can someone show me how to do this, please?

The Attempt at a Solution



Does it have something to do with these compounds being consisted of diatomic molecules?
HI(aq) is 2, but HBr(g) is not 2. I'm guessing it has something to do with the fact that one is aq and the other is a gas, but how does that affect it? How many ions would HBr(g) have?
And the N2S5 one is not 7 ions. Why? I am confused. Please help!
 
Last edited:
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HI(aq) - where do the ions come from?
 
H+ and I- so the answer to that one is 2 ions, right?
But what I'm confused on is HBr(g). Why wouldn't that also be 2 ions?
 
What is the process that creates H+ and I- in HI(aq)?
 
dissociation in aq solution.
but how does that help me see the HBr? its a gas so it's not dissociating right?
 
Last edited:
name_ask17 said:
but how does that help me see the HBr? its a gas so it's not dissociating right?

Yes.

Can't help you with the N2S5. As far as I know such compound doesn't exist.
 
so i still don't understand HBr would have only 1 ion then? or none?
 
None, it doesn't dissociate, so there are only molecules present.
 
ohhh i understand. thank you
so i know you said that you didnt know about the n2s5.. but since it also doesn't dissociate, it it also 0 ions? does that make sense or no?
or would it be 2 ions for the n2 and s8? i don't really know, actually.
 
  • #10
If you HAVE to give some answer other than "question doesn't make sense", then 0 makes the most sense.
 
  • #11
does it have something to do with it being a binary molecular compound?
 
Last edited:
  • #12
Sorry, no idea what you are asking about. What does have something to do with N2S5 being a binary molecular compound?

(actually - in the context of the question - it doesn't matter if it is a binary compound or not, it doesn't exist and the story ends there)
 
  • #13
ok i will talk to my professor about it. thank you so much for your help. i appreciate it.
 

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