Helpstudent402
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 6 months ago
#1
a In the first stage, ammonia is converted into nitrogen monoxide and the following equilibrium is established.
4NH3(g)  5O2(g) ⇌ 4NO(g)  6H2O(g) ∆H  –905 kJ mol–1
In terms of redox, state what happens to the ammonia in the forward reaction.

The nitrogen in NH3 goes from an oxidiation state of -3 to +2
The hydrogen in NH3 goes from an oxidation state of +3 to +1.
So how am I meant to tell whether ammonia is oxidised or reduced ??
0
reply
Ani240
Badges: 3
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 6 months ago
#2
Since the oxidation number of Nitrogen went from negative to positive it is oxidised while the hydrogen is reduced
Attached files
0
reply
Helpstudent402
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report Thread starter 6 months ago
#3
(Original post by Ani240)
Since the oxidation number of Nitrogen went from negative to positive it is oxidised while the hydrogen is reduced
But why as a whole is ammonia considered to be oxidised when both components of the compound have different things happening to them???
0
reply
Ani240
Badges: 3
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 6 months ago
#4
https://www.google.com/url?sa=t&sour...IBBAF&usg=AOvV

Since NH3 is a reducing agent,it gets oxidised
0
reply
Pigster
Badges: 20
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report 6 months ago
#5
(Original post by Helpstudent402)
But why as a whole is ammonia considered to be oxidised when both components of the compound have different things happening to them???
"ammonia" doesn't get oxidised. The nitrogen atom in ammonia gets oxidised.
0
reply
jack_harrison
Badges: 8
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report 6 months ago
#6
Might want to double check your assignment of ammonia's hydrogen oxidation state. The hydrogens in both ammonia and water are in the +1 oxidation state, so nothing happens to them during this reaction.
Last edited by jack_harrison; 6 months ago
0
reply
deskochan
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#7
Report 6 months ago
#7
The nitrogen in NH3 goes from an oxidation state of -3 to +2 (Right)
The hydrogen in NH3 is without any change in the oxidation state.
4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g)
NH3 is a reducing agent and oxygen gas is an oxidizing agent and the oxygen is reduced by NH3 from 0 to -2.
1
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Would you give consent for uni's to contact your parent/trusted person in a mental health crisis?

Yes - my parent/carer (64)
32.65%
Yes - a trusted person (54)
27.55%
No (52)
26.53%
I'm not sure (26)
13.27%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise