On Windows/macOS Chrome runs in separate sandboxes to prevent the whole application from crashing mostly.
This does theoretically use more memory.
I have not been able to establish how this works on Android. It seems to use one RAM slot from what I have gathered.
I was hopefully that it separated them into separate processes like on the PC so that Android can dispose of unused apps when aren't using them to save RAM usage. It may just be my phone but it appears to get slower the more tabs I have open.