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How to find NO2 at equilibrium?

2NO2 <=>N2O4

A chemist investigating this reaction started with 10 moles of NO2 and allowed the system to reach equilibrium.

If 3 mole of N2O4 are formed the number of moles of NO2 at equilibrium is???
Original post by Hazel99
2NO2 <=>N2O4

A chemist investigating this reaction started with 10 moles of NO2 and allowed the system to reach equilibrium.

If 3 mole of N2O4 are formed the number of moles of NO2 at equilibrium is???


How many moles of NO2 have to react to form 1 mol of N2O4?
Reply 2
Avatar for Hazel99
Hazel99
OP
10
Original post by charco
How many moles of NO2 have to react to form 1 mol of N2O4?



20 moles? because started with ten but NO2 has a big 2 in front.
Original post by Hazel99
20 moles? because started with ten but NO2 has a big 2 in front.


From the equation you need to react 2 moles of NO2 together to get 1 mole of N2O4

Therefore if 3 mol of N2O4 are formed ....
Reply 4
Avatar for Hazel99
Hazel99
OP
10
[QUOTE=charco;68023160]From the equation you need to react 2 moles of NO2 together to get 1 mole of N2O4

Therefore if 3 mol of N2O4 are formed ....

Oh...that simple 😂thanks
Here late, but nah, this is wrong.

4 moles are formed.
Original post by charco
From the equation you need to react 2 moles of NO2 together to get 1 mole of N2O4

Therefore if 3 mol of N2O4 are formed ....
Original post by ColtTheWolf
Here late, but nah, this is wrong.

4 moles are formed.

read the OP again ...
Original post by charco
read the OP again ...

I've just gotten this question and it's saying that it's 4 moles in the mark scheme? O_o

I'm getting confused.
Reply 8
Avatar for Dizgurl
Dizgurl
15
Original post by ColtTheWolf
I've just gotten this question and it's saying that it's 4 moles in the mark scheme? O_o

I'm getting confused.

I'm pretty sure its 4 moles of NO2 too.
10- 2(3)= 4 due to 2 lots of NO2 reacting to make N2O4
yeah I thought 4?
Original post by Dizgurl
I'm pretty sure its 4 moles of NO2 too.
10- 2(3)= 4 due to 2 lots of NO2 reacting to make N2O4

It's a language issue ...

There are 4 moles REMAINING, not "formed".

I originally replied to the statement:


Here late, but nah, this is wrong.

4 moles are formed.


The question tells you that 3 moles of N2O4 are FORMED and asks you for the moles of NO2.

I originally explained this about 2 year ago, by saying:


From the equation you need to react 2 moles of NO2 together to get 1 mole of N2O4

Therefore if 3 mol of N2O4 are formed ....


Notice the dots.They are didactic.

It is to help the OP find the answer for himself.
(edited 4 years ago)

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