Some kind of hickory. Where I live I would call it mockernut, Carya tomentosa.

Why do you say it’s dying? First and best advice is to get it out of that glass death trap and then ease it gradually into better light. Your new container must have at least one drainage hole....unlike that current one! The mix appears reasonable. Its terribly drawn out/etiolated through lack of light. Where is it kept? Where do you live, please add info after your name like most do, often helps us give better advice. How often has it been watered, and with what amount, the mix does appear to be dry so I am wondering how warm it’s kept and how dry? Gill

Here is minethe one to the upper right is villosa so you can see the difference

Thanks for the tips ... The Peperomia is definitely graveolens. I believe #2 is correctly ID'd as Echeveria pulvinata (Chenille Plant). Everything on this thread is ID'd. Thank you. These were acquired at a local garden club exchange. We have another one this weekend ... Yippee.