I have two fourteen inch titanium rods in my back and spacers what would that weight be?

Titanium weighs .162 pounds per cubic inch. This is as far as I can get to addressing your question due to the lack of dimensions. If you could give me a rough estimate on the diameter of the rods and how many spacers you have, I can get you a decent estimate. Edit this answer with a little more estimates and I can update my answer.

I'll assume the rod is half inch diameter.

2(Pir2h)*.162 = weight of both the rods.

2(3.14 x .252 x 14) x .162 = .89 lbs with no spacers.