If a microscope has a resolution of 300 nm and you use it to observe 2 cells that are 320 nm apart, would they look blurry, or will you be able to see 2 separate cells?

will be able to see 2 separate cells

Explanation:

Resolution in simple terms can be defined as the minimum distance between any two objects up to which an optical device can produce two separate images of these closely placed objects.

Here,  in this case the resolution of microscope is 300 nm thus any two objects which are placed 300 nm apart will result into production of a blur image.

In this case two cells are placed 320 nm apart and since this distance is larger than 300 nm ,  microscope will  produce images of two separate cells.