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

  • Thread starter Thread starter name_ask17
  • Start date Start date
  • Tags Tags
    Chemistry Formula
Click For Summary
SUMMARY

The discussion focuses on determining the number of ions present in one formula unit of the compounds HI(aq), HBr(g), and N2S5. HI(aq) dissociates into two ions, H+ and I-, resulting in a total of 2 ions. In contrast, HBr(g) does not dissociate in its gaseous state, leading to only 1 molecule and thus 0 ions. N2S5 is identified as a non-existent compound, and therefore, it also has 0 ions. The key takeaway is that dissociation in solution is crucial for identifying the number of ions in a compound.

PREREQUISITES
  • Understanding of ionic and molecular compounds
  • Knowledge of dissociation in aqueous solutions
  • Familiarity with chemical formulas and their representations
  • Basic concepts of binary molecular compounds
NEXT STEPS
  • Study the process of dissociation in aqueous solutions using examples like NaCl and HCl
  • Research the properties and behavior of diatomic molecules in different states (solid, liquid, gas)
  • Learn about binary molecular compounds and their characteristics
  • Explore the concept of ionic versus molecular compounds in chemistry
USEFUL FOR

Chemistry students, educators, and anyone seeking to understand the principles of ionic dissociation and molecular compounds.

name_ask17
Messages
146
Reaction score
0

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:
Physics news on Phys.org
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.
 

Similar threads

Chemistry Finding the molecular formula of an unknown hydrocarbon
  • · Replies 4 ·
Replies
4
Views
3K
Chemistry Understanding how to calculate pH of a buffer solution
  • · Replies 2 ·
Replies
2
Views
2K
Chemistry How to take into account autoprotolysis in weak base solution?
  • · Replies 8 ·
Replies
8
Views
2K
Chemistry How do we interpret the steps in the algorithm to balance a redox equation?
  • · Replies 7 ·
Replies
7
Views
2K
Chemistry How to calculate pH at equivalence point using this alternative?
  • · Replies 7 ·
Replies
7
Views
2K
Chemistry How to find the pH of a galvanic cell (MIT OCW problem set)
  • · Replies 2 ·
Replies
2
Views
4K
What Is the Molarity of Potassium Ions in a Potassium Sulfite Solution?
  • · Replies 2 ·
Replies
2
Views
4K
Ochem: H2O & HBr Reactions 2nd Semester Organic Chemistry
  • · Replies 1 ·
Replies
1
Views
5K
How Much Pb(NO3)2 Is Needed to Precipitate PbBr2 from HBr Solution?
  • · Replies 3 ·
Replies
3
Views
6K
Chemistry How do we know ##BF_3## has Lewis structure but ##Al_2S_3## does not?
  • · Replies 1 ·
Replies
1
Views
2K