So it just broke.....can you see the masterlink on the chain or did it come apart at the masterlink.
If you just lost the master link then just go buy one or if you dont really care about the bike just go buy a master link and run it till it breaks again.
If the chain is worn out then so are the sprockets and they will need to be replaced as well.
if you simply broke the chain and the sprockets are still like new then just buy a correct size chain of better quality and install it.
I myself would almost NEVER just replace a chain alone unless there was a reason for it to have failed, usually(most always) you have do the chain and sprockets as a set or else the worn sprockets will start to mess up the new chain.
I personally think there is more wrong with the bike but then again I cant actually look at it to tell for sure.
