1995 Toyota Corolla My car makes noise after going 40mph

Hi, I just bought a 95 toyota corolla 1.8L dx car and it just recently started making a very loud noise. I have shaking in my car because the engine mounts needs to be replaced but I dont believe that is why my car is making so much noise. It only make this loud noise when I am on the freeway or on the regular roads going more than 40mph. Anything you can do to possibly help would be great thanks,
Karyssa