(16/128)*8.34 = 1.0425 lbs. SG gravity of a typical IPA is 1.018.
1.018 * 1.0425 = 1.061 lbs
Weight of a standard pint glass is ~0.94 lbs.
0.94 + 1.06 = 2 lb curl
I'm not doing the math to calculate subsequent curls as you drink the fluid. That would probably require a differential equation - on a second thought probably not since it is not a constant flow of being consumed. Beer is not consumed with a straw but rather an X oz gulp. How many Y gulps is a beer?