If it's a replaceable hanger, then there should only be one (or possibly two) that fit that model year frame. I'd make sure you haven't bent up the rear derailleur, whole thing might need replacing....usually the hangers only break when they're torqued up, by a stick or a jammed chain (which can be caused by a bent derailleur cage). And grain of salt from a former bike wrench, but how many miles on that drive train? Can't tell accurately, but it looks like there is a lot of drivetrain/chain wear, which if left unattended might cause similar damage. I'm all for DIY, but make sure you're addressing the the reason why that thing snapped in the first place. At least have a shop (or friend) check the chain wear (or DIY with a caliper); chains stretch and if not replaced will permanently damage all the other drivetrain components. Good luck!
Forget that chain part, yours looks like it's already toast, twisted at the jockey wheel.