Can you?
yes, anything can be motorized if you believe in yourself.
Should you?
I would be hesitant to ride on a thirty five pound, aluminum frame bicycle that had been motorized unless it's top speed was less than 20MPH
looking at that bike, with those tires and the gear on it, if it only weights thirty five pounds like that you are looking at a very light frame. I would not rely on such a light frame with a motor on it, the tubing it likely much to thinly walled to handle the vibrations.
maybe as a friction drive or E-bike, but an in-frame motor on this bike may be a recipie for pain.
at this price though you can probably find a nice and solid steel-framed bike on craigslist.