MacBook Pro disk utility - disk0s2 not mounted I am trying to erase all data from my laptop and reinstall OS X before I trade in.

I erased all data on Macintosh HD but now when I go to reinstall OS X there is no hard drive appearing when prompted to select a hard drive to install OS X.  I go back to disk utility and Macintosh HD is gone, it has been replaced with disk0s2 which is not mounted.  

Here is a picture of my disk utility.  I am not sure how to fix this issue so I can get OS X reinstalled.



Here are the results of running diskutil
Select the parent of disk0s2 in Disk Utility and try the erase operation again, at least twice if it doesn't work first time. If that works, proceed with the reinstallation of OS X.