how much ram can i add to a mid 2010 mac book pro

It can take a total of 8GB.

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Yes, if its the 7,1 model.

http://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3

16.0GB (8.0GB + 8.0GB) OWC PC8500 DDR3 1066MHz SO-DIMM 204 Pin w/Lifetime Warranty

*For MacBook Pro 13.3" Mid 2010 (Model ID MacBookPro7,1) Only*

Only if it’s a Core 2 Duo Mac. If it’s an i5 or i7, doing that will result in a kernel panic upon startup.

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