The Haber Process

[mariatachejian]

Hi everyone,
I was working on some of the Haber process and ammonia questions and this one thing confused me.
I have the chem course notes and this one sentence says,
The Haber Process is exothermic, as ∆H= -92kJ/mol
I found other resources that say the same thing.

However, I found some other notes online that say:
For every mole of ammonia formed, 46 kJ of energy is released

I'm just getting confused which one it is, or if one energy amount is for forward reaction and the other is reverse.
Can anyone explain?
Thanks

[supR]

Hi everyone,
I was working on some of the Haber process and ammonia questions and this one thing confused me.
I have the chem course notes and this one sentence says,
The Haber Process is exothermic, as ∆H= -92kJ/mol
I found other resources that say the same thing.

However, I found some other notes online that say:
For every mole of ammonia formed, 46 kJ of energy is released

I'm just getting confused which one it is, or if one energy amount is for forward reaction and the other is reverse.
Can anyone explain?
Thanks

Hey, I've seen this before and had the same reaction as you!

Essentially, both are correct. Whaaaaat?

The equation that involves N₂ + 3H₂ --> 2NH₃ will say ∆H= -92kJ/mol as there are 2 moles of NH₃ being produced. If you divide everything by 2, then when 1 mole of NH₃ is produced, then ∆H= -46kJ/mol (Notice how 46 is half of 92),

I hope that clears things up.

[mariatachejian]

woooowwww
makes sense, thank you