Macbook5,1 Crashing Multiple Times Per Day
Troubleshooting is often a process of elimination and does require patience, so you'll need to keep that in mind as you proceed.

The first thing I would do now is test your MBP in Safe Mode. 

Boot into Safe Mode

Follow these steps to boot your MBP into Safe Mode:


Fully shut down your Mac
Restart your Mac
Immediately press the Shift key and keep it down 
Let go of the Shift key when you see the login window (NOTE: If you have FileVault enabled you may need to log in twice).
Now use your MBP in Safe Mode until it crashes again or until you're satisfied it's not going to crash (i.e. you may be at this step for some hours or even longer)
Exit Safe Mode by restarting your Mac as normal
Once again, test to see if your MBP still crashes


If you find that your MBP works fine while in Safe Mode, but not when booted normally, then it's likely to be a login item, corrupted font, or kernel extension).

If you find that your MBP still crashes, then it's most likely a hardware problem (although, before investigating that further, you could boot up again and use Safari (or another browser) instead of Chrome just to see if Chrome is causing you some sort of conflict).

Investigating login items, fonts, and kernel extensions

Let's start with Login Items:


Startup normally
Go to System Preferences > Users &amp; Groups
Select the Login Items tab
Take a note of your Login Items 
Now remove all of them by highlighting them and clicking on the - button below
Restart your computer


Now your Mac will boot up without those login items loading. Test to see if you can use your Mac without it crashing:


If you can, you know one (or more) of the Login items were causing the problem. You can then add them back in one by one until you've identified the culprit. Problem solved.
If the problem does persist, it's either a problem with fonts you've installed yourself or with a 3rd party kernel extension. A little more info below:


Fonts:- You can remove any of the fonts you've installed yourself to see if this makes a difference.

Kernel Extensions:- You can open Terminal (found within your Utilites folder) and enter the following command:

kextstat | grep -v com.apple

The above command will list 3rd party kernel extensions (you may need to stretch the Terminal window so it's easier to read). Look for anything you don't remember installing, or something that belongs to software you've removed, or just anything that looks out of place. Remember though, this is a list of 3rd party kernel extensions and therefore any of them could be causing the problem.