posted by Anonymous .
What energy in kJ is required to break 4.24 mol of NH3 into atoms? As noted below, this information can be used to calculate ΔH for gas-phase reactions.
I got 1376.18, which is wrong.
All help is appreciated!
It would have helped if you had given the information "as noted below."
Look up the bond energy for N-H bond and times 3 will give you 1 mol NH3. Multiply that by 4.24.
True, sorry I forgot about that. I did what you said though and got it right, so thanks!