How much does a sheet of 716x4x8 osb weigh?

Trick question! A single sheet of OSB weighs about 1.5 lbs per sf or 47 lbs, assuing you are asking about 7/16" thick, not 716. One sheet of plywood weighs a bit more. There is no such thing as OSB plywood! That is like asking how much does a motorcycle car cost?