Answer : Not studied by many scientists.
Explanation : An emerging scientific idea should be something which is not commonly studied by most of the scientists. If it is found to be common with many scientific ideas then it may not be considered as emerging scientific idea. It has to be unique, different and innovative from rest of the ideas.
The concentration of NaOH might change depending on the severity (or amount) of the spill. The acid sample will dissociate or acidify the NaOH to reduce it's concentration. A reduced amount of acid sample may affect the concentration of NaOH.
The balanced reaction between nitrogen and hydrogen to form ammoinia is as shown.
N2 + 3H2=2NH3
Dividing everything by 3
1/3N2 + H2 = 2/3NH3
All the hydrogen reacts with 1/3 of 0.5 atm of N2
The amount of product is 2/3 × 0.6 atm = 0.4 atm NH3
The unreacted nitrogen is 2/3 × 0.6 atm =0.4 atm Nitrogen
That adds up to 0.8 atm