I was given extra credit to find who Le Châtelier's High School Principal was.

Not his PrincipLE, but his PrincipAL.

My chemistry teacher told us only one student of his out of all these years came with the answer.

Think outside of the box. Thanks.

I thought outside the box, inside the box, on top of the box and under the box but I had no luck. I hope your teacher gives more credit for UNDERSTANDING his PRINCIPLE than for finding his h.s. PRINCIPAL.