Lab
posted by Diana .
When doing a virtual lab everything is exact, but why would they still ask for absolute and relative errors?

The equations and numbers may be exact; however, the answers obtained may not be the exact answer to the problem. So there will be an absolute and a relative error associated with the lab answer. I don't know what kind of virtual lab you performed; however, one such example would be the determination of percent S in Fe2S3. The mL of titrant and M of titrant are done exactly in the virtual lab but the answer obtained may be higher or lower than the actual (real) percent S.

I did a virtual lab on acceleration on gravity on earth. That number is 9.81 m/s ^2. I don't understand the error that could have came out of this

So you arrived at an answer? Was it different than 9.8066 (that number comes from Wikipedia)? If so the absolute error is (your answer  9.8066 m/s) = ?? or
delta