It's LSD.
Well the image of the molecule represents it, that doesn't prove that it's actually LSD on the blotter. But hey let's say it is.
It could have any potency (with some limitation that is not that relevant here), so 10 hits isn't necessarily so strong. It's just 'statistically' probable that it is.
What seems important is if your friend ever took that batch before, how many, and how strong that was. That should tell you everything. If he never took this batch before, buckle up to be sure.