GCSE Chemistry > Haber Process. The Haber process is the process by which Ammonia is produced. Simply put, it involves combining Nitrogen and Hydrogen together as the second equation below shows. This is a reversible reaction. The nitrogen needed for the reaction comes from the fractional distillation of liquid air.
Sooner than later is a pretty new expression, picking up in the 1940s, though sooner or later is a much older and more common expression. As to its grammatical correctness; it is certainly idiomatic and idioms seem to be allowed a lot of latitude on the grammatical front.
The short answer: As soon as you can. The long answer: It is obvious that some e-mails will be more important to you than others. It also is clear that we only have so much time in a day and there will be days where you will be unable to reply to any e-mails at all. So, you do the best you can to reply to everyone as soon as you can.