A lot! I split my own wood at home as we use firewood in the house as a primary heat, so I have an ample supply stocked up aging and seasoning for 2 to 3 years rotation all the time.
When camping, I'll take the oldest, because the bark has fallen off or peals off very easy. And in Indiana, you can bring your own wood into the State Parks again, if it's been debarked.
With that said, I have 3 Army duffle bags I use to carry my camping firewood. Believe it or not, one is from my daughter when she was in the Navy - her original duffle bag (2005). I have my original duffle bag when I was in the Army (1982). And I have my Dad's original duffle bag from when he was in the Army, (1950 Korean war). Those suckers are indestructible!
I fill them with 15-24 pieces of wood, depending on how fine they are split. But when the bag is full, it's probably 50-60 pounds. And if the pieces are split bigger, or smaller, regardless of the number, the weight is about the same. These bags are about 3.5 feet long and maybe 5 feet in circumference.
An entire "cord" you are probably talking a thousand pounds or more.
EDIT:
Good info there Campfire Time! Thanks!